CN111006023B - Air Acceleration Sealing Device - Google Patents
Air Acceleration Sealing Device Download PDFInfo
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- CN111006023B CN111006023B CN201911220488.8A CN201911220488A CN111006023B CN 111006023 B CN111006023 B CN 111006023B CN 201911220488 A CN201911220488 A CN 201911220488A CN 111006023 B CN111006023 B CN 111006023B
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- sealing
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- rotating shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/42—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by centrifugal force
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
本发明提供一种空气加速密封装置，在转轴的密封面外周侧固定有呈环形的密封体，密封体的轴向内侧为油槽，在密封体与转轴之间设有多个加速密封单元，所述加速密封单元固定在转轴上，随转轴同步旋转；所述加速密封单元、所述转轴以及所述密封体形成第一环槽腔，所述加速密封单元与所述密封体在靠近油槽一侧具有缝隙，使第一环槽腔与油槽相连通，所述加速密封单元在第一环槽腔内具有多个倾斜的扇叶，所述扇叶随着所述转轴旋转，使第一环槽腔内的空气向所述缝隙处集中。本发明的加速密封单元上的扇叶倾斜方向与转轴旋转方向相同，并且均匀分布在加速密封单元主体上。加速密封单元在转轴的旋转作用下，产生离心流体风压，使油槽内的油雾难以向外逸出。
The present invention provides an air acceleration sealing device, wherein a ring-shaped sealing body is fixed on the outer peripheral side of the sealing surface of a rotating shaft, the axial inner side of the sealing body is an oil groove, and a plurality of acceleration sealing units are arranged between the sealing body and the rotating shaft, wherein the acceleration sealing unit is fixed on the rotating shaft and rotates synchronously with the rotating shaft; the acceleration sealing unit, the rotating shaft and the sealing body form a first annular groove cavity, wherein the acceleration sealing unit and the sealing body have a gap on the side close to the oil groove, so that the first annular groove cavity is connected with the oil groove, and the acceleration sealing unit has a plurality of inclined blades in the first annular groove cavity, wherein the blades rotate with the rotating shaft, so that the air in the first annular groove cavity is concentrated toward the gap. The inclination direction of the blades on the acceleration sealing unit of the present invention is the same as the rotation direction of the rotating shaft, and the blades are evenly distributed on the main body of the acceleration sealing unit. Under the rotation of the rotating shaft, the acceleration sealing unit generates centrifugal fluid wind pressure, so that the oil mist in the oil groove is difficult to escape outward.
Description
Technical Field
The invention relates to an air acceleration sealing device which is mainly used for sealing a rotating shaft bearing of a large-sized generator set.
Background
At present, the sealing forms of large-scale rotating machinery equipment are labyrinth, contact and comb teeth sealing forms, but the phenomena of oil throwing, oil leakage and oil mist escape of the large-scale rotating machinery bearing oil tank are inevitably avoided, and the escaped oil mist can cause great negative influence on the running environment of the generator.
Disclosure of Invention
The invention aims to provide an air acceleration sealing device which can prevent oil mist from escaping.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an air accelerating sealing device is characterized in that an annular sealing body is fixed on the outer peripheral side of a sealing surface of a rotating shaft, an oil groove is formed in the inner side of the sealing body in the axial direction, a plurality of accelerating sealing units are arranged between the sealing body and the rotating shaft, and the accelerating sealing units are fixed on the rotating shaft and synchronously rotate along with the rotating shaft;
The accelerating sealing unit, the rotating shaft and the sealing body form a first annular groove cavity, a gap is formed on one side, close to the oil groove, of the accelerating sealing unit and the sealing body, the first annular groove cavity is communicated with the oil groove, the accelerating sealing unit is provided with a plurality of inclined fan blades in the first annular groove cavity, and the fan blades rotate along with the rotating shaft, so that air in the first annular groove cavity is concentrated to the gap.
The air accelerating sealing device comprises a first annular groove cavity, a sealing body, an air inlet, an air outlet and an air supply unit, wherein the air inlet is arranged on the outer side of the first annular groove cavity in the axial direction, the air outlet is arranged on one side of the first annular groove cavity, which is radially adjacent to the sealing body, and is close to the gap, and the air supply unit is fixed on the sealing body and is communicated with the air inlet through an air supply pipeline.
The air acceleration sealing device is characterized in that an air supply unit is provided with an air supply active control valve, a first air pressure monitor is arranged at an air supply inlet, and the first air pressure monitor is in signal communication with the air supply active control valve.
The air accelerating sealing device is characterized in that a second volute sealing cavity communicated with the first annular groove cavity through a gas outlet is arranged in the sealing body.
The air accelerating sealing device is characterized in that an air guiding device is arranged at the air outlet and comprises a plurality of air guiding channels, so that the angle of air flow blown out from the air outlet is closer to the tangential direction of the edge of the spiral case of the second spiral case sealing cavity.
The air accelerating sealing device is characterized in that an oil mist absorbing pipeline is arranged on an outlet of the second volute sealing cavity and is communicated to a first-stage outlet condenser.
The air accelerating sealing device is characterized in that the oil mist absorbing pipeline is arranged along the tangential direction of the outlet of the second volute sealing cavity.
The air acceleration sealing device is characterized in that an oil mist absorption active control valve is arranged on the oil mist absorption pipeline, a second wind pressure monitor is arranged at the outlet of the second volute sealing cavity, and the second wind pressure monitor is in signal connection with the oil mist absorption active control valve.
The air accelerating sealing device is characterized in that a filtering unit is arranged in the primary outlet condenser, and a gravity releaser is arranged at the bottom of the primary outlet condenser.
The air accelerating sealing device is characterized in that the outlet of the primary outlet condenser is communicated with the secondary outlet condenser.
Compared with the prior art, the invention has the beneficial effects that the fan blades on the accelerating sealing unit are inclined in the same direction as the rotating direction of the rotating shaft and are uniformly distributed on the accelerating sealing unit main body. Under the rotation action of the rotating shaft, the accelerating sealing unit generates centrifugal fluid wind pressure, so that oil mist in the oil groove is difficult to escape outwards.
Drawings
FIG. 1 is a schematic plan view of an air acceleration seal;
FIG. 2 is a cross-sectional block diagram of the acceleration seal unit (section A-A of FIG. 1);
FIG. 3 is a P-view of FIG. 2;
FIG. 4 is a schematic cross-sectional structural view of the air supply path of the air acceleration seal device (section B-B of FIG. 1);
FIG. 5 is a schematic cross-sectional structural view of the air outlet path of the air acceleration seal (section C-C of FIG. 1).
The reference numerals indicate that the sealing body 1, the end face connecting bolt 2, the rotating shaft 3, the accelerating sealing unit 4, the fan blade 5, the air guiding device 6, the air supplying unit 7, the first-stage outlet condenser 8, the air supplying pipeline 9, the air supplying active control valve 10, the first air pressure monitor 11, the filtering unit 12, the oil mist absorbing pipeline 13, the oil mist absorbing active control valve 14, the gravity releaser 15, the second-stage outlet condenser 16, the first annular groove cavity 17, the second volute sealing cavity 18, the second air pressure monitor 19 and the oil groove A.
Detailed Description
The invention provides an air accelerating sealing device, as shown in figures 1-5, mainly comprising a sealing body 1 which is annular and fixed on the outer peripheral side of a sealing surface of a rotating shaft 3, wherein the inner side of the sealing body 1 in the axial direction is an oil groove A, the sealing body 1 is connected with a machine set rack through an end face connecting bolt 2, a plurality of accelerating sealing units 4 are arranged between the sealing body 1 and the rotating shaft 3, and the accelerating sealing units 4 are fixed on the rotating shaft 3 and synchronously rotate along with the rotating shaft 3;
The sealing body 1 and the accelerating sealing unit 4 are made of light materials, so that the use requirements of strength and hardness are met, and the installation, adjustment, maintenance and maintenance of products are facilitated;
the accelerating seal unit 4, the rotating shaft 3 and the seal body 1 form a first annular groove cavity 17, a gap is formed between the accelerating seal unit 4 and the seal body 1 at one side close to the oil groove A, so that the first annular groove cavity 17 is communicated with the oil groove A, the accelerating seal unit 4 is provided with a plurality of inclined fan blades 5 in the first annular groove cavity 17, the fan blades 5 rotate along with the rotating shaft 3, so that air in the first annular groove cavity 17 is concentrated towards the gap, and oil mist in the oil groove A can be prevented from entering the first annular groove cavity 17 from the gap;
An air supply inlet is formed in the axial outer side of the first annular groove cavity 17, a gas outlet is formed in one side, radially adjacent to the sealing body 1, of the first annular groove cavity 17, and the gas outlet is close to the gap;
an air supply unit 7 (such as a fan) is also fixed on the sealing body 1, the air supply unit 7 is communicated with the air supply inlet through an air supply pipeline, an air supply active control valve 10 is arranged on the air supply unit 7, a first air pressure monitor 11 is arranged at the air supply inlet, and the first air pressure monitor 11 is in signal communication with the air supply active control valve 10;
A second volute sealing cavity 18 communicated with the first annular cavity 17 through a gas outlet is arranged in the sealing body 1, an air guiding device 6 is arranged at the gas outlet, and as shown in fig. 3, the air guiding device 6 comprises a plurality of air guiding channels, so that the angle of the air flow blown out from the gas outlet is closer to the tangential direction of the volute edge of the second volute sealing cavity 18;
an oil mist absorption pipeline 13 is arranged on the outlet of the second volute seal cavity 18 along the tangential direction, the oil mist absorption pipeline 13 is communicated to the primary outlet condenser 8, an oil mist absorption active control valve 14 is arranged on the oil mist absorption pipeline 13, a second wind pressure monitor 19 is arranged at the outlet of the second volute seal cavity 18, and the second wind pressure monitor 19 is in signal connection with the oil mist absorption active control valve 14;
The filter unit 12 is arranged in the primary outlet condenser 8, the gravity releaser 15 is arranged at the bottom of the primary outlet condenser 8, and the outlet of the primary outlet condenser 8 is communicated with the secondary outlet condenser 16.
When the oil mist sealing device is used, the sealing body 1 and the accelerating sealing unit 4 rotate together with the rotating shaft 3, air in the first annular groove cavity 17 generates wind pressure fluid seal under the action of centrifugal force, oil mist can be limited to escape to the first annular groove cavity 17, if the first wind pressure monitor 11 senses that the air pressure in the first annular groove cavity 17 is insufficient (or under a certain time interval), the air supply active control valve 10 is started and closed at proper time, wind pressure sent into the first annular groove cavity 17 by the air supply unit 7 and the oil mist which is generated by the accelerating sealing unit 4 and is driven to escape enter the second volute sealing cavity 18 together, so that the second volute sealing cavity 18 forms certain pressure, and the oil mist in the oil mist groove A is difficult to enter the first annular groove cavity 17 to play a role in wind pressure sealing;
When the second wind pressure monitor 19 senses that the air pressure in the second volute seal cavity 18 is higher (or under a certain time interval), the oil mist absorbing active control valve 14 is started and closed timely, the first-stage outlet condenser 8 works to absorb oil mist into the first-stage outlet condenser 8 for treatment, clean air is guided to the second-stage outlet condenser 16 for observation through the air outlet connected with the outer side of the first-stage outlet condenser 8 after being filtered by the filtering unit 12 contained in the first-stage outlet condenser 8, and filtered oil returns to the oil tank A again through the gravity releaser 15 at the bottom side of the first-stage outlet condenser 8.
It can be seen that the blades 5 on the accelerating seal unit 4 of the present invention have the same inclination direction as the rotation direction of the rotating shaft 3, and are uniformly distributed on the main body of the accelerating seal unit 4. Under the rotation action of the rotating shaft 3, the acceleration sealing unit 4 generates centrifugal fluid wind pressure, so that oil mist in the oil groove A is difficult to escape outwards. The air guiding device 6 is arranged on the side, close to the accelerating sealing unit 4, of the sealing body 1, when the accelerating sealing unit 4 generates wind pressure through centrifugal action, the wind pressure can smoothly enter the second volute sealing cavity 18 through the air guiding device 6, most of gas can be conveyed into the first-stage outlet condenser 8 through the oil mist sucking pipeline 13 by the second volute sealing cavity 18, the rest of gas can be remained in the second volute sealing cavity 18 to form fluid seal, and oil mist in the oil tank A is prevented from escaping.
The sealing body 1 is provided with an air supply unit 7, the air supply unit 7 is connected with the sealing body 1 through an air supply pipeline, air supplied by the air supply unit 7 enters the first annular groove cavity 17 through the air supply pipeline, then enters the accelerating sealing unit 4 through the first annular groove cavity 17, and enters the second volute sealing cavity 18 together with air pressure generated by the accelerating sealing unit 4. The air supply unit 7 is provided with an air pressure monitor and an air supply active control valve 10 near the first annular groove cavity 17, so that the pressure of the whole set of device can be kept within a set value range all the time.
The air outlet of the sealing body 1 is provided with a primary outlet condenser 8, the primary outlet condenser 8 is connected with the air outlet of the sealing body 1 through an oil mist suction pipeline 13, an air inlet of the primary outlet condenser 8 is connected with an air outlet of a second volute sealing cavity 18, and an air outlet of the primary outlet condenser 8 is connected with a secondary outlet condenser 16. Most of the gas in the second volute seal cavity 18 enters the first-stage outlet condenser 8 through the oil mist absorption pipeline 13 for treatment, a filtering unit 12 is arranged in the first-stage outlet condenser 8, oil mist is filtered by the filtering unit 12, oil is returned into the oil return tank A through a gravity releaser 15 below the first-stage outlet condenser 8, and filtered clean air enters the second-stage outlet condenser 16 for centralized treatment again. An oil mist absorbing active control valve 14 and a wind pressure monitor are arranged on the side, close to the second volute seal cavity 18, of the oil mist absorbing pipeline 13, so that the pressure in the whole device can be kept within a set value range all the time.
Claims (7)
1. An air accelerating sealing device is characterized in that an annular sealing body is fixed on the outer peripheral side of a sealing surface of a rotating shaft, an oil groove is formed in the inner side of the sealing body in the axial direction, a plurality of accelerating sealing units are arranged between the sealing body and the rotating shaft, and the accelerating sealing units are fixed on the rotating shaft and synchronously rotate along with the rotating shaft;
The accelerating sealing unit, the rotating shaft and the sealing body form a first annular cavity, a gap is formed between the accelerating sealing unit and the sealing body at one side close to the oil groove, so that the first annular cavity is communicated with the oil groove, the accelerating sealing unit is internally provided with a plurality of inclined fan blades, the fan blades rotate along with the rotating shaft, so that air in the first annular cavity is concentrated towards the gap, an air supply inlet is formed in the outer side of the first annular cavity in the axial direction, a gas outlet is formed in one side, radially adjacent to the sealing body, of the first annular cavity, and the gas outlet is close to the gap;
The sealing body is also fixedly provided with an air supply unit which is communicated with the air supply inlet through an air supply pipeline, the sealing body is internally provided with a second volute sealing cavity which is communicated with the first annular groove cavity through the air outlet, the air outlet is provided with an air guiding device, and the air guiding device comprises a plurality of air guiding channels, so that the angle of air flow blown out from the air outlet is close to the tangential direction of the volute edge of the second volute sealing cavity.
2. The air acceleration sealing apparatus of claim 1, wherein an air supply unit is provided with an air supply active control valve, and a first air pressure monitor is provided at an air supply inlet, the first air pressure monitor being in signal communication with the air supply active control valve.
3. The air acceleration sealing device of claim 1, wherein the outlet of the second volute sealing cavity is provided with an oil mist absorption pipeline, and the oil mist absorption pipeline is communicated to the first-stage outlet condenser.
4. The air acceleration seal set of claim 3, wherein the oil mist absorbing line is arranged tangentially to the outlet of the second volute seal chamber.
5. The air acceleration sealing device of claim 3, wherein the oil mist absorbing pipe is provided with an oil mist absorbing active control valve, a second wind pressure monitor is arranged at the outlet of the second volute sealing cavity, and the second wind pressure monitor is in signal connection with the oil mist absorbing active control valve.
6. The air acceleration sealing set of claim 3, wherein a filter unit is arranged in the primary outlet condenser, and a gravity releaser is arranged at the bottom of the primary outlet condenser.
7. The air acceleration seal set of claim 6, wherein the outlet of the primary outlet condenser is connected to the secondary outlet condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220488.8A CN111006023B (en) | 2019-12-03 | 2019-12-03 | Air Acceleration Sealing Device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911220488.8A CN111006023B (en) | 2019-12-03 | 2019-12-03 | Air Acceleration Sealing Device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111006023A CN111006023A (en) | 2020-04-14 |
| CN111006023B true CN111006023B (en) | 2025-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911220488.8A Active CN111006023B (en) | 2019-12-03 | 2019-12-03 | Air Acceleration Sealing Device |
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| CN (1) | CN111006023B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112555422B (en) * | 2020-11-02 | 2023-03-24 | 中国长江电力股份有限公司 | Self-pumping self-adjusting circulating sealing system and using method |
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|---|---|---|---|---|
| KR20130055921A (en) * | 2011-11-21 | 2013-05-29 | 한국수자원공사 | Oil mist reduction device |
| JP2015021517A (en) * | 2013-07-16 | 2015-02-02 | 株式会社東芝 | Oil leakage prevention system for bearing device |
| CN108757272A (en) * | 2018-06-04 | 2018-11-06 | 中国长江电力股份有限公司 | A kind of turbine-generator units thrust bearing air-tight structure and method |
| CN211525547U (en) * | 2019-12-03 | 2020-09-18 | 福建棉花滩水电开发有限公司 | Air accelerating sealing device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05263949A (en) * | 1992-01-20 | 1993-10-12 | Toshiba Corp | Shaft sealing device of bearing oil tank |
| JP2004347058A (en) * | 2003-05-23 | 2004-12-09 | Toshiba Plant Systems & Services Corp | Rotary machine bearing oil seal device |
| JP4719448B2 (en) * | 2004-10-29 | 2011-07-06 | 株式会社松浦機械製作所 | Non-contact seal structure for rotating shaft |
| CN203248734U (en) * | 2013-04-28 | 2013-10-23 | 中国长江电力股份有限公司 | Micro-positive-pressure oil groove sealing cover |
| CN104896291A (en) * | 2015-05-20 | 2015-09-09 | 中国长江电力股份有限公司 | Self-pumped water-turbine generator set bearing oil mist absorption device |
| CN206419152U (en) * | 2016-12-22 | 2017-08-18 | 重庆水轮机厂有限责任公司 | A kind of high speed hydrogenerator bearing seal cover structure |
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2019
- 2019-12-03 CN CN201911220488.8A patent/CN111006023B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130055921A (en) * | 2011-11-21 | 2013-05-29 | 한국수자원공사 | Oil mist reduction device |
| JP2015021517A (en) * | 2013-07-16 | 2015-02-02 | 株式会社東芝 | Oil leakage prevention system for bearing device |
| CN108757272A (en) * | 2018-06-04 | 2018-11-06 | 中国长江电力股份有限公司 | A kind of turbine-generator units thrust bearing air-tight structure and method |
| CN211525547U (en) * | 2019-12-03 | 2020-09-18 | 福建棉花滩水电开发有限公司 | Air accelerating sealing device |
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| CN111006023A (en) | 2020-04-14 |
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