CN107178458A - The comprehensive treatment system and method for a kind of bearing of hydraulic generator mist of oil - Google Patents
The comprehensive treatment system and method for a kind of bearing of hydraulic generator mist of oil Download PDFInfo
- Publication number
- CN107178458A CN107178458A CN201710589628.3A CN201710589628A CN107178458A CN 107178458 A CN107178458 A CN 107178458A CN 201710589628 A CN201710589628 A CN 201710589628A CN 107178458 A CN107178458 A CN 107178458A
- Authority
- CN
- China
- Prior art keywords
- oil
- mist
- bearing
- rotating shaft
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/06—Bearing arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/006—Sealing arrangements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The present invention relates to a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil and method, including bearing and rotating shaft, the upper end of rotating shaft is provided with bearing oil groove, bearing oil groove is provided with highly dense capping, highly dense capping is connected by combination sealing with rotating shaft, combination sealing also by it is described it is highly dense capping be divided into above and below two chambers, upper chamber be provided with air-supply arrangement, lower chambers be provided with mist of oil automatic processing device；The lower end of bearing is additionally provided with the oil-containing groove being connected with rotating shaft.The present invention is originated with generator mist of oil takes sealing to stop the administering method reclaimed with suction, thoroughly solves the problem of hydraulic turbine generator mist of oil, ensures turbine-generator units safe operation；Do not change generator shaft bearing structure, originated with generator mist of oil and take sealing to stop the method reclaimed with suction, thoroughly solve oil groove mist of oil, install convenient, later maintenance amount is small, practical.
Description
Technical field
The present invention relates to technical field of hydroelectric generation, particularly a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil
And method.
Background technology
In power station, bearing of hydraulic generator is full of lubricating oil in bearing oil groove as the important load bearing component of unit
It is lubricated and cools down, the static oil motion of movement means of unit running process middle (center) bearing, the dynamic and static part of bearing is in work
Middle frictional heat, so as to cause oil temperature to raise, the oil in oil groove splashes to oil groove outer wall under the influence of centrifugal force, agitation, from
And oil droplet, mist of oil is overflowed from oil groove cover plate, gear oil pipe and combinatorial surface etc. at gap, mist of oil random groups ventilating path expands everywhere
Dissipate, not only to consume substantial amounts of lubricating oil, but also severe contamination generator stator core, stator bar and rotor coil, drop
The dielectric strength and service life of low stator bar and rotor coil, seriously jeopardize unit safety stable operation.
Although it is close that the dynamo bearing oil groove in current part power station employs stabilier, oil mist absorbing device, contact oil groove
The oil mist prevention measures such as capping, but the actual effect that mist of oil is administered is undesirable.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of Synthetic of bearing of hydraulic generator mist of oil
System and method is managed, the application takes sealing to stop the administering method reclaimed with suction, thoroughly solve hydraulic turbine generator oil
The problem of mist, is not only simple in structure, install convenient, and later maintenance amount is small, practical.
The purpose of the present invention is achieved through the following technical solutions：
A kind of comprehensive treatment system of bearing of hydraulic generator mist of oil, including bearing and rotating shaft, the bearing holder (housing, cover) are located at institute
State in rotating shaft, the upper end of the rotating shaft is additionally provided with the bearing oil groove being connected with the bearing, the bearing oil groove and is additionally provided with height
Closure, it is described it is highly dense capping be connected by combination sealing with the rotating shaft, the combination sealing by three contact sealing teeth with
Two flexible sealing fin compositions, circumferentially direction is divided into even number part to contact sealing tooth, and the side of the contact sealing tooth is also set
There is spring, the spring drives contact sealing tooth to realize that footpath is marched forward or footpath is drawn back with the rotation of rotating shaft；The combination is close
Envelope also by the highly dense capping be divided into above and below two chambers, upper chamber is provided with air-supply arrangement, and lower chambers automatically process provided with mist of oil
Device；The lower end of the bearing is additionally provided with the oil-containing groove being connected with the rotating shaft.
Further, in the preferred embodiment of the invention, is additionally provided with below the combination sealing position of highly dense capping
One oil scraper ring.
Further, in the preferred embodiment of the invention, the is additionally provided with above oil-containing groove and rotating shaft link position
Two oil scraper rings.
Further, in the preferred embodiment of the invention, the first oil scraper ring and the second oil scraper ring are nonmetallic compound
Material.
Further, in the preferred embodiment of the invention, upper chamber is additionally provided with air-supply arrangement air outlet, in air-supply arrangement
Air outlet position is also equipped with first check-valve.
Further, in the preferred embodiment of the invention, lower chambers are additionally provided with area from absorbing smoke outwards mouthful and oil extraction mist mouthful, in oil suction
Mist mouthful and oil extraction mist mouthful are respectively equipped with second check-valve and the 3rd check-valves.
Further, in the preferred embodiment of the invention, high sealing, which is covered, is also equipped with six respirators, the breathing
Device is used to the mist of oil in oil groove condensing into oil droplet.
Further, in the preferred embodiment of the invention, two are additionally provided with oil-containing groove bottom is used to discharge long-pending oil
Oil exit pipe.
A kind of comprehensive processing method of bearing of hydraulic generator mist of oil, comprises the following steps：
S1, by it is highly dense capping be divided into above and below two chambers, by upper chamber air-supply arrangement convey forced air, prevent this
Region forms negative pressure, blocks mist of oil to leak passage, and the oil in bearing oil groove is aspirated by the mist of oil automatic processing device in lower chambers
Mist；
S2, install the first oil scraper ring and the second oil scraper ring additional in rotating shaft so that mist of oil condenses into oil droplet in confined space,
It is easy to reclaim.
Further, in the preferred embodiment of the invention, it is set in high sealing and covers installation respirator so that bearing oil
The external and internal pressure of groove keeps balance.
The beneficial effects of the invention are as follows：
(1) being originated with generator mist of oil takes sealing to stop the administering method reclaimed with suction, thoroughly solves the hydraulic turbine
The problem of generator mist of oil, ensures turbine-generator units safe operation；
(2) do not change generator shaft bearing structure, originated with generator mist of oil and take sealing to stop the method reclaimed with suction,
Oil groove mist of oil thoroughly is solved, install convenient, later maintenance amount is small, practical.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structural representation of the highly dense capping of the present invention；
In figure, 101- bearings, 102- rotating shafts, 103- combination sealings, 104- air-supply arrangements, 105- bearing oil grooves, 106-
One oil scraper ring, the oil scraper rings of 107- second, 108- oil-containing grooves, 109- upper chamber, 110- lower chambers.
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.It should be noted that, in the case where not conflicting, following examples and implementation
Feature in example can be mutually combined.
It should be noted that the diagram provided in following examples only illustrates the basic structure of the present invention in a schematic way
Think, then in schema only display with relevant component in the present invention rather than according to component count, shape and the size during actual implement
Draw, it is actual when implementing, and kenel, quantity and the ratio of each component can be a kind of random change, and its assembly layout kenel
It is likely more complexity.
Embodiment：
A kind of comprehensive treatment system of bearing of hydraulic generator mist of oil, is referred to shown in accompanying drawing 1 and accompanying drawing 2, including bearing
101 and rotating shaft 102, the bearing 101 is sheathed in the rotating shaft 102, and the upper end of the rotating shaft 102 is additionally provided with and the bearing
Highly dense capping is additionally provided with 101 connected bearing oil grooves 105, the bearing oil groove 105, the highly dense capping passes through combination sealing
103 are connected with the rotating shaft 102, and the combination sealing 103 seals tooth (not shown) and two flexible sealing fins by three contacts
(not shown) is constituted, and circumferentially direction is divided into even number part to contact sealing tooth, and the side of the contact sealing tooth is additionally provided with spring
(not shown), the spring drives contact sealing tooth to realize that footpath is marched forward or footpath is drawn back with the rotation of rotating shaft 102；Described group
Close sealing 103 also by it is described it is highly dense capping be divided into above and below two chambers, upper chamber 109 be provided with air-supply arrangement 104, lower chambers 110
Provided with mist of oil automatic processing device；The lower end of the bearing 101 is additionally provided with the oil-containing groove 108 being connected with the rotating shaft 102；In height
The first oil scraper ring 106 is additionally provided with below the position of combination sealing 103 of closure, in oil-containing groove 108 and the link position of rotating shaft 102
Top is additionally provided with the second oil scraper ring 107, and the first oil scraper ring 106 and the second oil scraper ring 107 are nonmetallic composite, upper chamber
109 are additionally provided with air-supply arrangement air outlet, and first check-valve (not shown), lower chambers are also equipped with air-supply arrangement air outlet position
110 are additionally provided with area from absorbing smoke outwards mouthful and oil extraction mist mouthful, area from absorbing smoke outwards mouthful and oil extraction mist mouth be respectively equipped with second check-valve (not shown) and
3rd check-valves (not shown), high sealing, which is covered, is also equipped with six respirator (not shown), and the respirator is used for bearing
Mist of oil in oil groove 105 condenses into oil droplet, and two oil exit pipes for being used to discharge long-pending oil are additionally provided with the bottom of oil-containing groove 108.
A kind of comprehensive processing method of bearing of hydraulic generator mist of oil, comprises the following steps：
S1, by it is highly dense capping be divided into above and below two chambers, forced air is conveyed by the air-supply arrangement 104 in upper chamber 109,
Prevent the region from forming negative pressure, block mist of oil to leak passage, bearing oil is aspirated by the mist of oil automatic processing device in lower chambers 110
Mist of oil in groove；
S2, install the first oil scraper ring 106 and the second oil scraper ring 107 additional in rotating shaft 102 so that mist of oil coagulates in confined space
Form oil droplet, be easy to reclaim.
Further, in the preferred embodiment of the invention, it is set in high sealing and covers installation respirator so that bearing oil
The external and internal pressure of groove 105 keeps balance.
It should be noted that the closure of oil groove has integrally been increased in bonding apparatus locus of the present invention, so as to increase axle
Hold the internal capacity of oil groove 105 so that more effectively increase the condensation space of mist of oil, the shape of mist of oil is alleviated to a certain extent
Into.
Further, it is additionally provided with the first oil scraper ring below the position of combination sealing 103 with rotating shaft 101 of highly dense capping
106, the first oil scraper ring 106 uses nonmetallic composite, and the first oil scraper ring 106 can prevent lubricating oil upward along rotating shaft 102
Climbing, the opposite face of the first oil scraper ring 106 is provided with mist of oil absorbed layer, can effectively absorb the oil droplet that oil scraper ring is thrown away, it is to avoid oil droplet
Splashes, further mitigate the formation and diffusion of mist of oil.
It should be noted that the highly dense capping of the present invention uses the movable sealing structure of combination sealing 103, combination sealing 103
Tooth is sealed by three contacts and two flexible sealing fins are constituted, and contact sealing tooth is circumferentially divided into even number part in direction, often etc.
Part contact sealing tooth can flexibly realize that footpath is marched forward or footpath is drawn back by the effect of spring, it is ensured that follow turning for rotating shaft 102
It is dynamic to accomplish real-time tracking, while spring is capable of the wear extent of effective compensation contact sealing tooth, realize contact sealing tooth and rotating shaft
102 zero clearance seals.Further, contact sealing teeth material uses nonmetallic composite, and the material has good self-lubricating
Function, coefficient of friction are smaller, and with the characteristic such as oil resistant, high temperature resistant, corrosion-resistant, and it is pointed tooth line to contact sealing tooth with big axle
Shape is contacted, and dramatically reduces the friction heat of sealing tooth and big between centers, good sealing barrier effect is played again.Flexible sealing
Piece has automatic sealing function, and flexible sealing fin is also made of nonmetallic composite, and the material has excellent self-lubricating
Performance, coefficient of friction are minimum, oil resistant, high temperature resistant, abrasion-resistant, unit in operation by air-supply arrangement 104 supplying gas and rotating shaft revolve
Change the line of production the collective effect of raw blast, flexible sealing fin is heaved automatically and be brought into close contact rotating shaft, reach optimal sealing state；Sealing
The combination sealing of lid can thoroughly avoid the clearance leakage of mist of oil and oil by rotating shaft 102 and highly dense capping.
Specifically, highly dense capping is divided into upper and lower two chambers by the combination sealing 103 of the present invention.In the upper of highly dense capping
Chamber 109 installs air-supply arrangement 104, and forced air is conveyed to upper chamber 109, prevents the region from being formed outside negative pressure, cut-off mist of oil
Passage is let out, and is conducive to flexible sealing fin to heave sealing automatically, optimal seal state is formed, and in the air outlet of air-supply arrangement 104
Side installs first check-valve additional, it is to avoid leaked in the stoppage in transit state mist of oil of air-supply arrangement 104 from air-supply passage air outlet；In highly dense capping
Lower chambers 110 install mist of oil automatic processing device, the mist of oil of lower chambers 110 are aspirated into oil mist treatment device, and mist of oil is entered
Row oil and air separation process, the oil after separation are back in bearing oil groove 105, and in mist of oil automatic processing device area from absorbing smoke outwards mouthful
Side and oil discharge outlet side install second check-valve additional, it is to avoid absorb processing from mist of oil in mist of oil automatic processing device stoppage in transit state mist of oil and lead to
Leak in road.Air-supply arrangement 104 and mist of oil automatic processing device are divided into two groups, using rotation Starting mode, realize taking out for mist of oil
Inhale and recycling.
In the present invention, high sealing covers 6 respirators of installation, and respirator is passing through the mist of oil in bearing oil groove 105
Deflection plate effect in respirator makes mist of oil condense into oil droplet, and oil droplet is flowed back into bearing oil groove 105, the air through filtration treatment
Bearing oil groove 105 is discharged, the internal and external pressure balance of bearing oil groove 105 has been ensured, it is to avoid mist of oil is because inside and outside in bearing oil groove 105
Pressure difference is big to be overflowed.
Further, oil-containing groove 108 is added between bearing 101 and rotating shaft 102, in the corresponding rotating shaft of oil-containing groove 108
Area top installs the second oil scraper ring 107 additional, by bearing oil groove 105 because the interior mist of oil for getting rid of oil and negative pressure sucking-off is enclosed in confined air
Between, mist of oil is condensed in confined space, by the second oil scraper ring 106 by the drip of condensation in oil-containing groove 108 so that
It efficiently avoid and the mist of oil diffusion that oil and negative pressure are suctioned out is got rid of in bearing oil groove 105；4 are installed on oil-containing groove 108 simultaneously to exhale
Haustorium, it is ensured that the internal and external pressure balance of oil-containing groove 108, prevents the inside of oil-containing groove 108 from producing big in larger negative pressure sucking-off bearing 101
Gauging mist, separately installs 2 oil exit pipes in the bottom of oil-containing groove 108, the long-pending oil periodically collected in discharge oil-containing groove 108, prevents from connecing oil
Long-pending oil is excessively largely leaked by combination sealing in groove 108.
Embodiment described above only expresses the embodiment of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.
Claims (10)
1. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil, it is characterised in that including bearing and rotating shaft, the bearing
It is sheathed in the rotating shaft, the upper end of the rotating shaft is additionally provided with the bearing oil groove being connected with the bearing, the bearing oil groove
Highly dense capping is additionally provided with, the highly dense capping is connected by combination sealing with the rotating shaft, and the combination sealing is by three contacts
Tooth and two flexible sealing fin compositions are sealed, circumferentially direction is divided into even number part to contact sealing tooth, the contact sealing tooth
Side is additionally provided with spring, and the spring drives contact sealing tooth to realize that footpath is marched forward or footpath is drawn back with the rotation of rotating shaft；Institute
State combination sealing also by it is described it is highly dense capping be divided into above and below two chambers, upper chamber be provided with air-supply arrangement, lower chambers be provided with mist of oil
Automatic processing device；The lower end of the bearing is additionally provided with the oil-containing groove being connected with the rotating shaft.
2. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that highly dense
The first oil scraper ring is additionally provided with below the combination sealing position of capping.
3. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that connecing oil
Groove above rotating shaft link position with being additionally provided with the second oil scraper ring.
4. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to Claims 2 or 3, it is characterised in that the
One oil scraper ring and the second oil scraper ring are nonmetallic composite.
5. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that upper chamber
Air-supply arrangement air outlet is additionally provided with, first check-valve is also equipped with air-supply arrangement air outlet position.
6. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that lower chambers
Area from absorbing smoke outwards mouthful and oil extraction mist mouthful are additionally provided with, second check-valve and the 3rd check-valves are respectively equipped with area from absorbing smoke outwards mouthful and oil extraction mist mouthful.
7. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that high sealing
Cover and be also equipped with six respirators, the respirator is used to the mist of oil in oil groove condensing into oil droplet.
8. a kind of comprehensive treatment system of bearing of hydraulic generator mist of oil according to claim 1, it is characterised in that connecing oil
Trench bottom is additionally provided with two oil exit pipes for being used to discharge long-pending oil.
9. a kind of comprehensive processing method of bearing of hydraulic generator mist of oil, it is characterised in that comprise the following steps：
S1, by it is highly dense capping be divided into above and below two chambers, by upper chamber air-supply arrangement convey forced air, prevent the region
Negative pressure is formed, blocks mist of oil to leak passage, the mist of oil in bearing oil groove is aspirated by the mist of oil automatic processing device in lower chambers；
S2, install the first oil scraper ring and the second oil scraper ring additional in rotating shaft so that mist of oil condenses into oil droplet in confined space, is easy to
Reclaim.
10. a kind of comprehensive processing method of bearing of hydraulic generator mist of oil according to claim 9, it is characterised in that setting
Installation respirator is covered in high sealing so that the external and internal pressure of bearing oil groove keeps balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710589628.3A CN107178458A (en) | 2017-07-19 | 2017-07-19 | The comprehensive treatment system and method for a kind of bearing of hydraulic generator mist of oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710589628.3A CN107178458A (en) | 2017-07-19 | 2017-07-19 | The comprehensive treatment system and method for a kind of bearing of hydraulic generator mist of oil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107178458A true CN107178458A (en) | 2017-09-19 |
Family
ID=59837427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710589628.3A Pending CN107178458A (en) | 2017-07-19 | 2017-07-19 | The comprehensive treatment system and method for a kind of bearing of hydraulic generator mist of oil |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107178458A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754077A (en) * | 2022-04-24 | 2022-07-15 | 华能澜沧江水电股份有限公司 | Oil mist prevention device for thrust bearing of hydroelectric generating set and using method thereof |
| CN115342294A (en) * | 2022-07-22 | 2022-11-15 | 天津市天发重型水电设备制造有限公司 | Novel bearing oil mist collection device |
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| JPH0960571A (en) * | 1995-08-28 | 1997-03-04 | Toshiba Corp | Shaft seal device of hydraulic machine |
| CN203248722U (en) * | 2013-05-08 | 2013-10-23 | 李荣耀 | Oil mist resistant device |
| CN103545974A (en) * | 2013-10-23 | 2014-01-29 | 中达电机股份有限公司 | Lubricating structure of bearing assembly of vertical motor for water conservancy and biochemistry |
| CN103615541A (en) * | 2013-11-29 | 2014-03-05 | 张宏伟 | Device preventing oil mist of generator bearing from overflowing |
| CN203627790U (en) * | 2013-11-28 | 2014-06-04 | 李荣耀 | Air sealing device |
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2017
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| JPH0960571A (en) * | 1995-08-28 | 1997-03-04 | Toshiba Corp | Shaft seal device of hydraulic machine |
| CN203248722U (en) * | 2013-05-08 | 2013-10-23 | 李荣耀 | Oil mist resistant device |
| CN103545974A (en) * | 2013-10-23 | 2014-01-29 | 中达电机股份有限公司 | Lubricating structure of bearing assembly of vertical motor for water conservancy and biochemistry |
| CN203627790U (en) * | 2013-11-28 | 2014-06-04 | 李荣耀 | Air sealing device |
| CN103615541A (en) * | 2013-11-29 | 2014-03-05 | 张宏伟 | Device preventing oil mist of generator bearing from overflowing |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754077A (en) * | 2022-04-24 | 2022-07-15 | 华能澜沧江水电股份有限公司 | Oil mist prevention device for thrust bearing of hydroelectric generating set and using method thereof |
| CN114754077B (en) * | 2022-04-24 | 2023-11-17 | 华能澜沧江水电股份有限公司 | Oil mist preventing device for thrust bearing of hydroelectric generating set and application method of oil mist preventing device |
| CN115342294A (en) * | 2022-07-22 | 2022-11-15 | 天津市天发重型水电设备制造有限公司 | Novel bearing oil mist collection device |
| CN115342294B (en) * | 2022-07-22 | 2023-09-12 | 天津市天发重型水电设备制造有限公司 | Bearing oil mist collection device |
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Application publication date: 20170919 |