CN211851925U - Hermetic seal oil shield for small steam turbine - Google Patents
Hermetic seal oil shield for small steam turbine Download PDFInfo
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- CN211851925U CN211851925U CN202020462461.1U CN202020462461U CN211851925U CN 211851925 U CN211851925 U CN 211851925U CN 202020462461 U CN202020462461 U CN 202020462461U CN 211851925 U CN211851925 U CN 211851925U
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- oil
- main body
- steam
- shield
- compressed air
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Abstract
The utility model discloses a sealed oil shield for little steam turbine relates to sealed oil shield technical field. The oil baffle is characterized in that a steam baffle main body of the oil baffle is fixedly connected with an oil baffle main body and then sleeved on a rotating shaft, and the oil baffle main body is fixed on a bearing box body; a plurality of copper teeth are embedded in the inner side wall of the steam shield main body along the length direction of the rotating shaft, and the steam shield plate is embedded in the inner side wall of the steam shield main body and is positioned on one side far away from the copper teeth; the steam shield main body is sequentially communicated with a pipeline interface, an air inlet, a pressure equalizing chamber and an air outlet, one end of a compressed air pipeline is assembled on the pipeline interface, the other end of the compressed air pipeline is connected with a compressed air generator, and compressed air enters the air inlet from the compressed air pipeline and enters a gap between the airtight oil shield and the rotating shaft through the pressure equalizing chamber; the oil keeps off the inner ring part and comprises oil fender inner ring and solid fixed ring, and oil fender inner ring joint is in the fixed ring, and oil keeps off the main part inside wall and forms the recess along radial concave, and gu fixed ring and recess are provided with compression spring through pre-buried magnet actuation between fixed ring and the recess.
Description
Technical Field
The utility model relates to a sealed oil keeps off technical field, concretely relates to a sealed oil that is used for little steam turbine keeps off.
Background
The bearing box of the steam turbine is close to the cylinder, the rotor of the steam turbine runs at a high speed under the support of the bearing, and an oil shield is arranged between the bearing box and the cylinder for sealing, so that on one hand, the steam leaked from the cylinder is prevented from entering the bearing box through a gap between the oil shield and the rotor, and the lubricating oil carries water, thereby causing the system instability and even the tile burning accident; on the other hand, the lubricating oil is prevented from seeping out along the oil block when the steam turbine rotates at high speed. However, a clearance for preventing dynamic and static friction must be left between the rotor and the oil baffle, and particularly when the unit is started and stopped, the rotor jumps greatly. The existing copper comb tooth type sealing structure is high in rigidity, copper comb teeth are easy to rub with a rotor in the operation process, and the gap between the abraded copper comb teeth and the rotor is increased, so that the copper comb teeth lose the sealing function. Therefore, the user needs to frequently change the copper teeth to ensure that the oil baffle is sealed, so that time and labor are wasted, and the production cost of the user is greatly increased.
Patent CN204573107U discloses a contact airtight oil catch, keeps off inner ring and compression spring through setting up oil, compensates the wearing and tearing volume of copper tooth in the operation, makes oil keep off the vibrations that adapt to the rotor and open and stop the in-process for oil keeps off inner ring and rotor clearance is zero all the time in the operation, reduces the replacement rate of copper tooth. However, the oil baffle inner ring is fixed on the inner ring main body through the bolt, stress is easily concentrated at the bolt hole in vibration, cracks appear at the hole after long-time use, the oil baffle inner ring is made of high-strength materials and high in machining precision to guarantee strength requirements, and production cost is increased invisibly. In addition, the bolt needs to be disassembled and assembled when the bolt is replaced, and thread failure is easily caused under the condition of repeated use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an airtight oil shield for little steam turbine, the oil that solves current airtight oil shield keeps off the problem that the inner ring easily leads to producing the crack and being difficult for changing because of local stress is too high.
In order to solve the technical problem, the utility model adopts the following technical scheme: the utility model provides a sealed oil catch for little steam turbine which characterized in that: the oil shield comprises an oil shield main body, a steam shield main body, an oil shield inner ring part, a steam shield plate and a compressed air pipeline, wherein the steam shield main body is fixedly connected with the oil shield main body and then sleeved on a rotating shaft, and the oil shield main body is fixed on a bearing box body;
a plurality of copper teeth are embedded in the inner side wall of the steam shield main body along the length direction of the rotating shaft, and a steam shield plate is embedded in the inner side wall of the steam shield main body and is positioned on one side far away from the copper teeth;
the steam shield main body is sequentially communicated with a pipeline interface, an air inlet, a pressure equalizing chamber and an air outlet, one end of a compressed air pipeline is assembled on the pipeline interface, the other end of the compressed air pipeline is connected with a compressed air generator, and compressed air enters the air inlet from the compressed air pipeline and enters a gap between the air-tight oil shield and the rotating shaft from the air outlet through the pressure equalizing chamber;
the oil keeps off the inner ring part and comprises oil fender inner ring and solid fixed ring, and oil fender inner ring joint is in the fixed ring, and oil keeps off the main part inside wall and forms the recess along radial concave, and gu fixed ring and recess are provided with compression spring through pre-buried magnet actuation between fixed ring and the recess.
The technical scheme is that the section of the inner ring of the oil baffle is T-shaped, and a positioning groove matched with the inner ring of the oil baffle is formed in the fixing ring.
The oil baffle is characterized in that the top of the section of the inner ring of the oil baffle is semicircular, the inner side wall of the fixing ring is inwards concave to form an arc-shaped positioning groove, and the inner ring of the oil baffle is clamped in the positioning groove.
The further technical proposal is that the compressed air pipeline is provided with an air filter.
The air filter is characterized by comprising a hollow shell and two filter screens, wherein the two filter screens are respectively positioned at an inlet and an outlet of the shell, and drying agents are filled in the filter screens.
The further technical proposal is that the inner ring of the oil baffle is a graphite ring.
The working principle is as follows: the whole set of air-tight seal oil baffle is composed of an oil baffle main body positioned on the bearing side and a steam baffle main body positioned on the cylinder side, wherein an air inlet is formed in the steam baffle main body, compressed air is sent into a pressure equalizing chamber through a compressed gas pipeline, and then distributed by the pressure equalizing chamber to enter each copper tooth from an air outlet, each copper tooth and an oil baffle inner ring and between each copper tooth and a steam baffle plate, the axial position of the air-tight seal oil baffle forms a positive pressure area from the middle part to two sides, the gap between the air-tight seal oil baffle and a rotating shaft is blocked by compressed air through applying the aerodynamic principle, steam and dust impurities leaked from the cylinder are prevented from entering a bearing box, lubricating oil is polluted, and the lubricating oil is.
When the oil baffle inner ring needs to be replaced, the oil baffle inner ring component is integrally pulled out, the fixing ring is aligned to the groove during assembly, and the assembly of the oil baffle inner ring component is extremely easily completed under the attraction of the embedded magnets.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the steam baffle is embedded in the steam baffle main body and integrally assembled with the steam baffle main body, coaxiality of the steam baffle and copper teeth is guaranteed, and integral assembly of the air-tight oil baffle is facilitated.
2. The arrangement of the pressure equalizing chamber enables compressed air to be buffered after entering the air-tight oil shield, so that the compressed air is more uniformly distributed among gaps, and the sealing effect of the oil shield is further improved.
3. And compression springs are arranged in the fixing rings and the grooves, so that the abrasion loss of the copper teeth in operation is compensated, the oil baffle is adaptive to the vibration of the rotating shaft in the starting and stopping process, the gap between the inner ring of the oil baffle and the rotating shaft is always zero in operation, and the replacement rate of the copper teeth is reduced.
4. The fixed ring and the groove are attracted by the embedded magnet between the fixed ring and the groove, so that the oil baffle inner ring can be disassembled and assembled, meanwhile, the integrity of the oil baffle inner ring is greatly guaranteed, and the strength of the oil baffle inner ring is better.
Drawings
Fig. 1 is a schematic structural diagram of an airtight oil seal for a small steam turbine according to the present invention.
Fig. 2 is a schematic view of a structure of the oil retainer inner ring component according to the present invention.
Fig. 3 is a schematic view of another structure of the oil retainer inner ring part according to the present invention.
In the figure: 1-oil baffle main body, 11-groove, 12-compression spring, 2-steam baffle main body, 21-copper tooth, 22-pipeline interface, 23-air inlet, 24-pressure equalizing chamber, 25-air outlet, 3-oil baffle inner ring component, 31-oil baffle inner ring, 32-fixing ring, 4-steam baffle, 5-compressed air pipeline, 6-rotating shaft, 7-air filter, 71-shell, 72-filter screen and 73-desiccant.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Fig. 1 shows a gas-tight oil seal for a small steam turbine, characterized in that: including oil fender main part 1, vapour fender main part 2, oil fender inner ring part 3, fender vapour board 4 and compressed air pipeline 5, cup joint on pivot 6 behind vapour fender main part 2 and the oil fender main part 1 fixed connection, oil keeps off main part 1 and fixes on the bearing box body. The length direction along pivot 6 on the vapour fender main part 2 inside wall inlays and has a plurality of copper teeth 21, keeps off vapour board 4 and inlays on vapour fender main part 2 inside wall and be located the one side of keeping away from copper teeth 21. The steam shield main body 2 is sequentially communicated with a pipeline connector 22, an air inlet 23, a pressure equalizing chamber 24 and an air outlet 25, one end of a compressed air pipeline 5 is assembled on the pipeline connector 22, the other end of the compressed air pipeline is connected with a compressed air generator, compressed air enters the air inlet 23 from the compressed air pipeline 5 and enters a gap between the air-tight oil shield and the rotating shaft 6 from the air outlet 25 through the pressure equalizing chamber 24. The oil keeps off inner ring part 3 comprises oil fender inner ring 31 and solid fixed ring 32, and oil fender inner ring 31 joint is in solid fixed ring 32, and 1 inside wall of oil fender main part is along radial concave formation recess 11, and gu fixed ring 32 and recess 11 are through pre-buried magnet actuation, are provided with compression spring 12 between solid fixed ring 32 and the recess 11.
The whole set of air-tight seal oil baffle is composed of an oil baffle main body 1 positioned on a bearing side and a steam baffle main body 2 positioned on a cylinder side, wherein an air inlet 23 is formed in the steam baffle main body 2, compressed air is sent into a pressure equalizing chamber 24 through an air inlet 23 through a compressed gas pipeline 5, then the compressed air is distributed by the pressure equalizing chamber 24 and enters each copper tooth 21, the copper teeth 21 and the oil baffle inner ring 31 and between the copper teeth 31 and the steam baffle 4 from an air outlet 25, the air-tight seal oil baffle forms a positive pressure area from the middle part to two sides along the axial position, and the compressed air is utilized to block the gap between the air-tight seal oil baffle and the rotating shaft 6 by applying the aerodynamic principle, so that steam and dust impurities exposed out of the cylinder are prevented from entering the bearing.
When the oil baffle inner ring part 31 needs to be replaced, the oil baffle inner ring part 3 is integrally pulled out, the fixing ring 32 is aligned to the groove 11 during assembly, and the assembly of the oil baffle inner ring part 3 is easily completed under the suction of the embedded magnet.
To use compressed air at a lower pressure, the copper teeth 21 are preferably arranged in three passes, one on one side of the exhaust port 25 and near the bearing, and two passes on the other side of the exhaust port 25 and near the cylinder side. At this time, the pressure of the steam leaking from the cylinder side is greatly reduced after passing through the two copper teeth 21, and the pressure of the compressed air for preventing the steam from entering the gap can be relatively set to be lower.
In order to facilitate the assembly of the inner oil baffle ring 31 and the fixing ring 32, fig. 2 shows the cross section of the inner oil baffle ring component 3, the cross section of the inner oil baffle ring 31 is t-shaped, and the fixing ring 32 is internally provided with a positioning groove matched with the inner oil baffle ring 31. After the top of the inner ring 31 of the oil retainer is placed along the positioning groove, the oil retainer can be assembled in place after rotating. In order to prevent the t-shaped top from being worn away from the positioning grooves during assembly, the top of the inner oil baffle ring 31 is semi-arc-shaped, and the inner side wall of the fixing ring 32 is inwards concave to form the arc-shaped positioning grooves, as shown in fig. 3. When the oil baffle inner ring 31 is worn, the oil baffle inner ring can be taken out and replaced, and the fixing ring 32 can be recycled.
The oil keeps off inner ring 31 preferred uses the inner ring of graphite material, and graphite itself has certain lubrication action, and the nature is stable under the high temperature, can effectively protect pivot 6.
Example 2
In order to further optimize the technical solution in embodiment 1, in this embodiment, an air filter 7 is disposed on the compressed air duct 5, the air filter 7 is composed of a hollow casing 71 and a filter screen 72, two filter screens 72 are disposed and located at an inlet and an outlet of the casing 71, respectively, and a drying agent 73 is filled in the filter screen 72. Compressed air becomes dry and clean compressed air and gets into in the oil shield after air cleaner 7, has further guaranteed the dry cleanness of environment between oil shield and the pivot 6, has guaranteed the life of steam turbine.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More particularly, various variations and modifications are possible in the component parts and/or arrangements within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a sealed oil catch for little steam turbine which characterized in that: the oil shield comprises an oil shield main body (1), a steam shield main body (2), an oil shield inner ring component (3), a steam shield plate (4) and a compressed air pipeline (5), wherein the steam shield main body (2) is fixedly connected with the oil shield main body (1) and then sleeved on a rotating shaft (6), and the oil shield main body (1) is fixed on a bearing box body;
a plurality of copper teeth (21) are embedded in the inner side wall of the steam shield main body (2) along the length direction of the rotating shaft (6), and the steam shield plate (4) is embedded in the inner side wall of the steam shield main body (2) and is positioned on one side far away from the copper teeth (21);
the steam shield main body (2) is sequentially communicated with a pipeline interface (22), an air inlet (23), a pressure equalizing chamber (24) and an air outlet (25), one end of a compressed air pipeline (5) is assembled on the pipeline interface (22), the other end of the compressed air pipeline is connected with a compressed air generator, compressed air enters the air inlet (23) from the compressed air pipeline (5) and enters a gap between the air-tight oil shield and the rotating shaft (6) from the air outlet (25) through the pressure equalizing chamber (24);
oil keeps off inner ring part (3) comprises oil fender inner ring (31) and solid fixed ring (32), and oil fender inner ring (31) joint is in solid fixed ring (32), and oil keeps off main part (1) inside wall along radial concave formation recess (11), gu fixed ring (32) and recess (11) are provided with compression spring (12) through pre-buried magnet actuation between solid fixed ring (32) and recess (11).
2. A hermetic seal oil dam for a small steam turbine in accordance with claim 1, wherein: the cross section of the oil baffle inner ring (31) is T-shaped, and a positioning groove matched with the oil baffle inner ring (31) is formed in the fixing ring (32).
3. A hermetic seal oil dam for a small steam turbine in accordance with claim 1, wherein: the top of the cross section of the inner oil baffle ring (31) is semicircular, the inner side wall of the fixing ring (32) is inwards concave to form an arc-shaped positioning groove, and the inner oil baffle ring (31) is clamped in the positioning groove.
4. A hermetic seal oil dam for a small steam turbine in accordance with claim 1, wherein: an air filter (7) is arranged on the compressed air pipeline (5).
5. A hermetic seal oil dam for small steam turbines according to claim 4, characterized in that: the air filter (7) is composed of a hollow shell (71) and two filter screens (72), the two filter screens (72) are respectively positioned at an inlet and an outlet of the shell (71), and drying agents (73) are filled in the filter screens (72).
6. A hermetic oil seal for a small steam turbine according to any one of claims 1 to 5, characterized in that: the oil baffle inner ring (31) is a graphite ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020462461.1U CN211851925U (en) | 2020-04-02 | 2020-04-02 | Hermetic seal oil shield for small steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020462461.1U CN211851925U (en) | 2020-04-02 | 2020-04-02 | Hermetic seal oil shield for small steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211851925U true CN211851925U (en) | 2020-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020462461.1U Expired - Fee Related CN211851925U (en) | 2020-04-02 | 2020-04-02 | Hermetic seal oil shield for small steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211851925U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109523A (en) * | 2021-11-24 | 2022-03-01 | 国家能源集团内蒙古电力有限公司 | Sealing assembly and steam turbine |
-
2020
- 2020-04-02 CN CN202020462461.1U patent/CN211851925U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109523A (en) * | 2021-11-24 | 2022-03-01 | 国家能源集团内蒙古电力有限公司 | Sealing assembly and steam turbine |
| CN114109523B (en) * | 2021-11-24 | 2023-08-25 | 国家能源集团内蒙古电力有限公司 | Seal assembly and steam turbine |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 Termination date: 20210402 |