CN111998009A - Gear coupling of main oil pump of steam turbine set and modification method thereof - Google Patents

Abstract

The invention provides a toothed coupling of a main oil pump of a steam turbine unit and a modification method thereof. The coupling comprises an outer toothed shaft sleeve, an inner toothed sleeve meshed with the outer toothed shaft sleeve, and a first toothed sleeve connected with the inner toothed sleeve by bolts. Two shaft sleeves, an oil baffle ring is arranged on the inner gear sleeve, a gap is formed between the oil baffle ring and the outer gear shaft sleeve, a sewage discharge channel is opened on the second shaft sleeve, and the sewage discharge channel is connected with the outer tooth shaft sleeve and the second shaft sleeve. The cavities in between are communicated. The invention has a simple structure, the lubricating oil is directly sprayed on the meshing teeth, the lubricating oil path is shortened, the lubricating effect is improved, the service life of the toothed coupling is prolonged, and the long-term operation is possible. The method includes: removing the original oil slinger, re-making the oil slinger with a flat plate and connecting it with the inner gear sleeve at the position of the original oil slinger, so that a gap is formed between the newly made oil slinger and the outer gear bushing, and The original oil channel and the drain hole are blocked, and the drain hole is opened on the disk surface of the second bushing.

Description

Gear coupling of main oil pump of steam turbine unit and its modification method

technical field

The invention relates to a toothed coupling.

Background technique

The structure of the toothed coupling used in the main oil pump of the steam turbine unit of the thermal power plant is shown in Figure 1. The toothed coupling includes an outer toothed shaft sleeve 1a and an inner toothed sleeve 2a meshing with the outer toothed shaft sleeve 1a. The second shaft sleeve 3a connected with the inner gear sleeve 2a, the oil passage 101a provided through the outer gear shaft sleeve 1a, the outer gear shaft sleeve 1a is also provided with an oil slinger 4a, the outer ring of the oil slinger 4a and the inner gear The sleeve 2a is in contact, a dirty oil channel 6a is provided between the oil slinger 4a and the inner gear sleeve 2a, and the inner gear sleeve 2a is provided with a drain channel 201a that communicates with the dirty oil channel 6a. When in use, the oil injection pipe 10a of the lubricating oil pump is set at one end of the oil passage 101a, and the lubricating oil flows from the oil passage 101a into the gap between the external gear bushing 1a and the second bushing 3a, and then turns to flow to the external gear bushing. 1a, on the meshing teeth of the inner tooth sleeve 2a, and then discharged through the dirty oil channel 6a and the sewage channel 201a. However, during the actual use of the toothed coupling, the lubricating oil passage is too long, resulting in poor lubrication effect, and meshing tooth defects often occur, so that the actual service life of the coupling is far less than the design life of 30 years, and further It also leads to the problems of coupling jamming, burning of thrust bearing bushes, and swing of the speed control system of the unit, which increases the risk of accidents. In addition, when the external gear shaft sleeve 1a is rotated until the oil passage 101a is not aligned with the fuel injection pipe 10a, the lubricating oil will be splashed, resulting in waste and pollution to equipment and sites.

Chinese Patent Publication No. CN103016556A discloses a vertical drum-shaped tooth coupling lubrication structure, the lubrication structure includes an inner gear sleeve, an upper gear shaft and a lower gear shaft meshing with the inner gear sleeve, and a circle in the middle of the inner gear sleeve. There is an overflow hole on the shaped boss, the overflow hole is connected with the meshing tooth gap of the upper gear shaft and the lower gear shaft, the lower part of the inner gear sleeve is also provided with a ring sleeve, and the lower gear shaft is also provided with an outer ring. It is sealingly matched with the outer ring and encloses an oil collecting cavity which is communicated with the tooth gap of the lower gear shaft. The vertical drum gear coupling lubrication structure collects lubricating oil at the upper end of the inner gear sleeve to lubricate the meshing teeth of the upper gear shaft, and allows the lubricating oil to flow out through the overflow hole to lubricate the meshing teeth of the lower gear shaft. The oil collecting cavity enclosed by the ring sleeve and the outer ring accumulates. As the oil level rises, the meshing teeth of the upper pinion and the lower pinion are soaked in the lubricating oil, so that each tooth is fully lubricated. The vertical drum-shaped tooth coupling requires the shaft to be connected to be a toothed shaft, and cannot solve the problem of splashing of the lubricating oil inlet at the end. In addition, the lubricating structure cannot discharge the polluted, deteriorated, and dirty lubricating oil in time, and needs to be disassembled regularly. Change the lubricating oil, not suitable for long-term operation.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a gear coupling of the main oil pump of a steam turbine unit and a modification method of the tooth coupling of the main oil pump of a steam turbine unit.

The present invention is achieved through the following technical solutions.

The toothed coupling of the main oil pump of the steam turbine set provided by the present invention includes an outer gear sleeve, an inner gear sleeve and a second shaft sleeve. They are connected by bolts, the inner gear sleeve is provided with an oil baffle ring, and a gap is formed between the oil baffle ring and the outer gear shaft sleeve, the second shaft sleeve is provided with a sewage channel, and the sewage channel and the outer tooth sleeve and the cavity between the second shaft sleeves is communicated.

The present invention has a simple structure, and when in use, the oil injection pipe is arranged on the gap between the oil retaining ring and the outer gear sleeve, and the lubricating oil is directly sprayed on the meshing teeth between the outer gear shaft sleeve and the inner gear sleeve, and the shortening is obviously shortened. The lubricating oil path is improved, the lubricating effect is improved, and the service life of the toothed coupling is prolonged. The present invention can also be lubricated by pressure oil supply, the lubricating oil sprays the impurities on the meshing teeth out, and discharges them in time through the sewage discharge channel, which keeps the lubricating oil clean, avoids the disassembly of the device to replace the lubricating oil, and enables the coupling to run for a long time.

The communication position between the sewage channel and the cavity is located on the outer annular surface of the cavity. When the second bushing is rotated until the sewage discharge channel is below, the dirty oil in the oil cavity can be drained in time and completely. Further, the diameter of the sewage channel is 3-4 mm. Further, the sewage channels are 2 to 4 evenly distributed along the circumference

The end face of the inner gear sleeve is provided with a limit step, and the limit step is in contact with the oil retaining ring. Prevent the slinger from moving in the direction of the meshing teeth. Further, an end cover is also provided on the end face of the oil deflector, and the end cover is detachably connected to the inner gear sleeve. The end cover and the inner gear sleeve are preferably connected by screw or screw connection, and the end cover can prevent the oil deflector from falling off. Further, the oil deflector is provided with an external thread to be connected with the internal gear sleeve. Compared with interference fit or welding, it is easy to remove and replace the oil deflector.

The thickness of the oil retaining ring is 3-4 mm.

The invention also provides a method for reforming the toothed coupling of the main oil pump of the steam turbine unit. The toothed coupling of the main oil pump of the steam turbine unit comprises an outer toothed shaft sleeve and an inner toothed sleeve engaged with the outer toothed shaft sleeve, and is connected with the toothed shaft sleeve through bolts. The second shaft sleeve connected with the inner gear sleeve, the outer gear shaft sleeve is provided with an oil channel running through it, and the outer gear shaft sleeve is also provided with an oil baffle ring, the outer ring of the oil baffle ring is in contact with the inner gear sleeve, and the oil baffle ring is connected to the inner gear sleeve. A dirty oil channel is arranged between the inner gear sleeves, and a sewage discharge hole communicated with the dirty oil channel is arranged on the inner gear sleeve. It is connected with the inner gear sleeve at the position of the oil retaining ring, so that a gap is formed between the newly made oil baffle ring and the outer gear shaft sleeve, the original oil passage and the sewage hole are blocked, and the sewage hole is opened on the disk surface of the second sleeve.

The cost of a single piece of the toothed coupling is about 150,000 yuan, and the average cost of the in-service toothed coupling after depreciation is about 100,000 yuan. If all of them are replaced, it will cause great economic losses. By adopting the transformation method of the toothed coupling of the main oil pump of the steam turbine unit provided by the present invention, the processing cost of a single coupling is less than 10,000 yuan, and the service life of the coupling is prolonged, and each coupling is modified. , the cost of 90,000 yuan can be saved. If the thermal power plants adopting this series of steam turbine oil injection pump couplings all over the country use the method provided by the invention to transform the couplings, it can not only prolong the service life of the couplings, but also reduce the risk of accidents. It can also produce huge economic benefits.

Further, to plug the original oil channel and the sewage hole, a conical plug is used to insert the oil channel and the sewage hole from the inside, and then seal and weld along the edge of the conical plug. Blocking first and then sealing and welding ensures the strength of the outer gear bushing and the inner gear bushing and enhances the sealing effect of the blocking.

The beneficial effects of the present invention are:

To sum up, the invention has simple structure, easy assembly and modification, improves the lubricating effect of the toothed coupling of the main oil pump of the steam turbine unit, prolongs the service life of the coupling, and also maintains the fluidity of the lubricating oil. Eliminate dirty oil and impurities carried by it, avoid disassembling the device to replace the lubricating oil, and can run for a long time. When the damage degree of the meshing teeth of the coupling is small and the remaining life is long, the method provided by the present invention can save an average cost of 90,000 yuan for each piece of the toothed coupling of the series, and the economic benefit is relatively large. .

Description of drawings

Fig. 1 is the structural representation of the gear coupling of the main oil pump of the existing steam turbine unit;

Figure 2 is a schematic structural diagram of the present invention.

In the picture: 1-external gear bushing; 2-internal gear bushing; 201-step surface; 3-second bushing; 301-sewage passage; 4-oil deflector; 5-bolt; 6-slot; 7-end Cover; 10-fuel injection pipe; 1a-external gear bushing; 101a-oil passage; 2a-internal gear bushing; 201a-sewage hole; 3a-second bushing; 4a-oil deflector; 5a-bolt; 6a- Dirty oil passage; 10a-fuel injection pipe.

Detailed ways

The technical scheme of the present invention is further described below, but the scope of protection is not limited to the description.

As shown in Figure 2 is the structural representation of the present invention:

The toothed coupling of the main oil pump of the steam turbine set provided by the present invention includes an outer gear sleeve 1, an inner gear sleeve 2, and a second shaft sleeve 3. The outer gear shaft sleeve 1 meshes with the inner gear sleeve 2, and the inner gear sleeve 2 It is connected with the second shaft sleeve 3 by bolts 5. The inner gear sleeve 2 is provided with an oil slinger 4, and there is a gap 6 between the oil slinger 4 and the outer gear shaft sleeve 1. The second shaft sleeve 3 is provided with a sewage channel 301 , and the sewage channel 301 is communicated with the cavity between the external gear shaft sleeve 1 and the second shaft sleeve 3 .

The present invention has a simple structure. When in use, the fuel injection pipe 10 is arranged on the gap 6 between the oil slinger 4 and the outer gear sleeve 1, and the lubricating oil is directly sprayed to the space between the outer gear shaft sleeve 1 and the inner gear sleeve 2. On the meshing teeth, the lubricating oil path is obviously shortened, the lubricating effect is improved, and the service life of the toothed coupling is prolonged. The present invention can also be lubricated by pressure oil supply, the lubricating oil sprays the impurities on the meshing teeth out, and discharges in time through the sewage discharge channel 301, which keeps the lubricating oil clean, avoids the disassembly of the device to replace the lubricating oil, and enables the coupling to operate for a long time.

The communication position between the sewage channel 301 and the cavity is located on the outer ring surface of the cavity. When the second bushing 3 is rotated until the sewage channel 301 is below, the dirty oil in the oil cavity can be drained in time and completely. Further, the diameter of the sewage channel 301 is 3-4 mm. Further, the sewage channels 301 are 2 to 4 evenly distributed along the circumference.

The end surface of the inner gear sleeve 2 is provided with a limit step, and the limit step is in contact with the oil retaining ring 4 . Prevent the slinger 4 from moving in the direction of the meshing teeth. Further, an end cover 7 is also provided on the end surface of the oil deflector 4 , and the end cover 7 is detachably connected to the inner gear sleeve 2 . The end cover 7 and the inner gear sleeve 2 are preferably connected by screw threads or screws, and the end cover 7 can prevent the oil deflector ring 4 from falling off. Further, the oil slinger 4 is provided with an external thread to be connected with the inner gear sleeve 2. Compared with interference fit or welding, it is convenient to disassemble and replace the oil deflector 4 .

The thickness of the oil retaining ring 4 is 3-4 mm.

The invention also provides a method for reforming the toothed coupling of the main oil pump of the steam turbine unit:

Figure 1 is a schematic diagram of the structure of the gear coupling of the main oil pump of the steam turbine unit. The tooth coupling of the main oil pump of the steam turbine unit includes an outer gear sleeve 1a and an inner gear sleeve 2a meshing with the outer gear shaft sleeve 1a. The second shaft sleeve 3a is connected with the inner gear sleeve 2a by the bolt 5a, the oil passage 101a is provided through the outer gear shaft sleeve 1a, and the outer gear shaft sleeve 1a is also provided with an oil slinger 4a. The ring is in contact with the inner gear sleeve 2a, a dirty oil channel 6a is arranged between the oil slinger 4a and the inner gear sleeve 2a, and the inner gear sleeve 2a is provided with a drain hole 201a that communicates with the dirty oil channel 6a. The method includes: removing the original The oil slinger 4a is removed, and the oil slinger 4 is remade by using a flat plate to connect with the inner gear sleeve 2a at the position of the original oil slinger 4a, so that a gap 6 is formed between the newly made oil slinger 4 and the outer gear sleeve 1a, and The original oil channel 101a and the drain hole 201a are blocked, and a drain channel 301 is opened on the disk surface of the second bushing 3a.

The cost of a single piece of the toothed coupling is about 150,000 yuan, and the average cost of the in-service toothed coupling after depreciation is about 100,000 yuan. If all of them are replaced, it will cause great economic losses. By adopting the transformation method of the toothed coupling of the main oil pump of the steam turbine unit provided by the present invention, the processing cost of a single coupling is less than 10,000 yuan, and the service life of the coupling is prolonged, and each coupling is modified. , the cost of 90,000 yuan can be saved. If the thermal power plants adopting this series of steam turbine oil injection pump couplings all over the country use the method provided by the invention to transform the couplings, it can not only prolong the service life of the couplings, but also reduce the risk of accidents. It can also produce huge economic benefits.

Further, the original oil channel 101a and the sewage hole 201a are blocked by using a conical plug to plug into the oil channel 101a and the sewage hole 201a from the inside, and then seal and weld along the edge of the conical plug. Blocking first and then sealing and welding ensures the strength of the outer gear bushing 1a and the inner gear bushing 2a and enhances the sealing effect of the blocking.

Claims (10)

1. A gear coupling of a main oil pump of a steam turbine unit, comprising an outer gear sleeve (1), an inner gear sleeve (2), a second shaft sleeve (3), the outer gear sleeve (1) and the inner gear sleeve (1) The sleeve (2) is meshed, and the inner gear sleeve (2) and the second shaft sleeve (3) are connected by bolts (5). , a gap (6) is provided between the oil slinger (4) and the outer gear sleeve (1), the second shaft sleeve (3) is provided with a sewage channel (301), the sewage channel (301) and the outer tooth The cavity between the shaft sleeve (1) and the second shaft sleeve (3) is communicated. 2 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 1 , wherein the communication position between the sewage channel ( 301 ) and the cavity is located on the outer annular surface of the cavity. 3 . 3 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 2 , wherein the diameter of the sewage channel ( 301 ) is 3-4 mm. 4 . 4 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 2 , wherein the sewage channels ( 301 ) are 2-4 uniformly distributed along the circumference. 5 . 5 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 1 , wherein the end surface of the inner gear sleeve ( 2 ) is provided with a limit step ( 201 ), and the limit step ( 201 ) is connected to the oil slinger ring. 6 . (4) Contact. 6. The toothed coupling of the main oil pump of the steam turbine unit according to claim 5, characterized in that: an end cover (7) is further provided on the end surface of the oil retaining ring (201), and the end cover (7) is detachable Connect to the inner gear sleeve (2). 7 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 5 , wherein the oil retaining ring ( 4 ) is provided with external threads to be connected with the inner gear sleeve ( 2 ). 8 . 8 . The toothed coupling of the main oil pump of the steam turbine unit according to claim 1 , wherein the thickness of the oil retaining ring ( 4 ) is 3-4 mm. 9 . 9. A method for reforming a toothed coupling of a main oil pump of a steam turbine unit, the toothed coupling of the main oil pump of a steam turbine unit comprising an outer toothed shaft sleeve (1a) and an inner toothed sleeve (1a) meshing with the outer toothed shaft sleeve (1a). 2a), the second shaft sleeve (3a) connected with the inner gear sleeve (2a) through the bolt (5a), the oil passage (101a) provided through the outer gear shaft sleeve (1a), the external gear shaft sleeve (1a) ) is also provided with a slinger ring (4a), the outer ring of the oil slinger (4a) is in contact with the inner gear sleeve (2a), and a dirty oil channel ( 6a), the inner gear sleeve (2a) is provided with a sewage channel (201a) communicating with the dirty oil channel (6a), which is characterized in that: the original oil slinger (4a) is removed, and the oil slinger (4a) is remade by using a flat plate. 4) Connect the original oil slinger (4a) with the inner gear sleeve (2a), so that a gap (6) is formed between the newly made oil slinger (4) and the outer gear sleeve (1a). The oil channel (101a) and the sewage channel (201a) are blocked, and a sewage channel (301) is opened on the disk surface of the second shaft sleeve (3a). 10. The method for reforming the toothed coupling of the main oil pump of a steam turbine unit according to claim 9, characterized in that : the original oil channel (101a) and the sewage channel (201a) are blocked by adopting conical blocking The head is plugged into the oil channel (101a) and the sewage channel (201a) from the inside, and then sealed and welded along the edge of the conical plug.

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