CN201062566Y - Hydraulic turbine main-shaft sealing arrangement - Google Patents
Hydraulic turbine main-shaft sealing arrangement Download PDFInfo
- Publication number
- CN201062566Y CN201062566Y CNU200720124568XU CN200720124568U CN201062566Y CN 201062566 Y CN201062566 Y CN 201062566Y CN U200720124568X U CNU200720124568X U CN U200720124568XU CN 200720124568 U CN200720124568 U CN 200720124568U CN 201062566 Y CN201062566 Y CN 201062566Y
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- China
- Prior art keywords
- main shaft
- rubber flat
- wear
- sealing
- flat plate
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- 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.)
- Expired - Fee Related
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- 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 utility model provides a sealing device of a water wheel main axle. The utility model comprises a sealing seat and a sealing cover installed at the upper end of the sealing seat, upper lower rubber flat plates are installed on the sealing seat, two wearing rings which are respectively and tightly stuck with two rubber flat plates are correspondingly installed on the main axle, top plates are respectively arranged on the lower plane of the two rubber flat plates, and pressure relief vents are arranged at the positions of the flat plates stuck with the two rubber flat plates. Three concentric ring-shaped labyrinth grooves are arranged on the plane of the wearing rings stuck with the two rubber flat plates. The utility model has the advantages that the structure is simple, the installation and maintenance is convenient, and the service life is long, and the utility model can the reliable water sealing of the water wheel main axle without adding water pressure when being used.
Description
Technical field
The utility model belongs to turbine technology field, specifically, relates to a kind of hydraulic turbine main shaft sealing device.
Background technique
At present, the main shaft seal of water turbine mainly contains following several mode:
1. packing main shaft seal
This is a kind of simple in structure, utilization main shaft seal mode the most widely, and it mainly is made up of packing box, asbestos packing and pressure ring.It is after earlier asbestos packing being soaked into paraffin, will to coat carbon dust on the asbestos packing again, asbestos packing is cut into several sections then and is packed in the packing box, after filling the 3-4 circle, compresses with pressure ring at last.Can seal main shaft though do like this, the shortcoming of its maximum is exactly that asbestos packing has carried out directly contacting with main shaft, and main shaft is easy to wearing and tearing when rotating, and it is serious to leak after wearing and tearing.
2. piston type main shaft seal
This is a kind of main shaft seal mode relatively more commonly used, it is to be made of piston body, piston, wear-resistant ring, stopper pin and bolt, nut etc., piston is installed in the piston body, its working principle is by hydraulic pressure piston to be moved down, piston and wearing plate, facing plate friction, thereby stop current to pass through, to reach the purpose of main shaft seal.Its shortcoming is because piston adopts water rubber to make, and water rubber has rising property of water, therefore the fit tolerance between piston and the piston body requires quite strictness, moreover owing to the manufacturing tolerances of rubber is difficult to guarantee, so cause the success rate of this kind sealing configuration not high; If operational effect is bad when beginning to install in addition, then be difficult to repair, and then very difficult recovery of piston scaling loss in running, also there is aging problem in rubber itself, so influence the sealing reliability of piston.
3. flat main shaft seal
Flat main shaft seal is divided into single flat main shaft seal and double-layer plate main shaft seal.Single flat main shaft seal be utilize the individual layer rubber flat plate with the end face that is fixed on the change formation on the main shaft between the crack, seal by hydraulic pressure, its simple in structure, good airproof performance, rubber flat plate directly do not contact with main shaft surface, can be as the packing main shaft seal wear spindle.But its shortcoming is a rubber flat plate in use wear and tear back and lift machine and make water leakage big.The double-layer plate main shaft seal is to utilize double-layer rubber flat board and two planes up and down that are fixed on the rotating disk on the main shaft, and inner chamber hydraulic action produces pressure towards two opposite directions respectively and is adjacent to rotating disk (hydraulic pressure is from external water system), plays the end face seal effect.It is compared with single flat main shaft seal, the structure more complicated, same this sealing, the wearing and tearing back and when lifting machine water leakage big, adjust more complicated, maintenance difficult.
4. radial seal
Utilize several layers of extractive carbon loaf or other high-abrasive materials, under modes such as mechanical spring, radially form radial sealing surfaces with the wear-resistant lining that is enclosed within on the main shaft, and lubricated by clean water, sealing block wearing and tearing back can move radially under the effect of spring, continue to be adjacent to mainshaft bushing, this seal structure complex is installed difficulty of maintenance, and the spring performance is difficult for guaranteeing, it is little radially to estimate one's own ability after the wearing and tearing, so adopt less at present.
In sum, existing hydraulic turbine main shaft sealing device all can not be realized reliable sealing sealing, often needs to introduce external hydraulic pressure and realizes sealing, and some apparatus structure is too complicated, and the installation and maintenance inconvenience lost efficacy in the use easily, and working life is short.
The model utility content
Problem to be solved in the utility model provides a kind of hydraulic pressure that need not add just can realize reliable sealing sealing, and simple in structure, easy for installation, the hydraulic turbine main shaft sealing device of long service life.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: it comprises sealing seat and is installed in the sealing cover of sealing seat upper end, two rubber flat plates up and down are installed on the sealing seat, correspondingly on the main shaft two wear-resistant rings are installed fit tightly with the last plane of above-mentioned two rubber flat plates respectively, the lower plane of two rubber flat plates is respectively equipped with top board, and the position that fits with rubber flat plate on the top board is provided with vent.
During work, the pressure of water acts on the rubber flat plate by the vent on the top board, and rubber flat plate is adjacent on wear-resistant ring, and the micro-gap between rubber flat plate and the wear-resistant ring can form the pressure moisture film, small pressure moisture film has not only played seal action, prevents that also sandstone from entering.The pressure moisture film makes and is contactless sealing between rubber flat plate and the wear-resistant ring, and the wearing and tearing between them are very little, thereby long service life.Owing to be provided with two rubber flat plates and wear-resistant ring up and down, be equivalent on main shaft, be provided with the two seals barrier, the water that enters from the gap between below rubber flat plate and the wear-resistant ring seldom, by then almost there not being current to advance sealing cover behind the gap between top rubber flat plate and the wear-resistant ring, sealing effect is very reliable again.Since power that rubber flat plate is pressed to wear-resistant ring be unified from the bottom up, thereby rely on self pressure of water in the indoor water turbine of rotary wheel of water turbine just can realize that sealing seals.
Technique effect of the present utility model is: can add hydraulic pressure and just can realize reliable sealing sealing, whole apparatus structure is simple, and is easy for installation, long service life.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the partial enlarged drawing of Fig. 1;
Fig. 3 be among Fig. 1 A to view.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, the hydraulic turbine main shaft sealing device that the utility model provides has sealing seat 1 and is installed in the sealing cover 2 of sealing seat 1 upper end, two rubber flat plates 3 and 4 are installed on the sealing seat 1 up and down, the corresponding two wear-resistant rings 6 and 7 that are equipped with fit tightly with the last plane of above-mentioned two rubber flat plates 3,4 respectively on the main shaft 5, the lower plane of two rubber flat plates 3,4 is respectively equipped with top board 8,9, and the position that fits with rubber flat plate 3,4 on the top board 8,9 is provided with vent 10.In order to make the sealing between sealing seat 1 and the sealing cover 2 more reliable, between sealing seat 1 and sealing cover 2, be provided with seal rubber pad 18; For the prevention of water seepage that makes progress, between sealing cover 1 and main shaft 5, be provided with seal ring 19.Gap between wear-resistant ring 6,7 and the rubber flat plate 3,4 is not more than 0.4mm, is preferably 0.2mm～0.4mm, is contactless sealing between rubber flat plate and the wear-resistant ring during work, and therefore wearing and tearing are very little, and working life is very long; And form the pressure moisture film at gap location, small pressure moisture film has not only played seal action, prevents that also sandstone from entering.
As Fig. 2, shown in Figure 3, the plane that fits with rubber flat plate 3,4 on the wear-resistant ring 6,7 is provided with the concentric ring-like maze trough 11 in three roads.One circular groove of the every process of water 11, water just carries out a step-down, hydraulic pressure is reduced gradually, thereby reduce its penetrating power, is equivalent to the labyrinth decompression principle, so this class groove often is known as maze trough.
As shown in Figure 1 and Figure 2, wear-resistant ring 6,7 is fixed on the wear-resistant ring body 12, and wear-resistant ring body 12 is installed on the main shaft 5 by axle sleeve 13.Wear-resistant ring 6,7 adopts wear-resisting steel to make, and they are processed into smooth flat with the plane that rubber flat plate 3,4 contacts, and reducing friction, and can form the gap moisture film between them, strengthens its block-water effect.Assemble after wear-resistant ring, wear-resistant ring body and axle sleeve are processed respectively again, be convenient to manufacturing and reduce manufacture cost, certainly, wear-resistant ring, wear-resistant ring body and axle sleeve also can be made the all-in-one-piece structure.
As shown in Figure 1 and Figure 2, described rubber flat plate 3,4 and top board 8,9 are installed on the sealing seat 1 by bolt 14, between the rubber flat plate 4 of centre and top board 8, be provided with gasket ring 15, thereby the two seals barrier that rubber flat plate and wear-resistant ring are formed has certain distance, water is able to step-down rapidly between the two seals barrier, thereby weakens the ability of the seepage second road sealing barrier. Top board 8,9 is provided with positioning step 20, in the time of between high pressure water is through wear-resistant ring 6,7 and rubber flat plate 3,4, having a masterpiece is used on the top board 8,9, this positioning step 20 leans on sealing seat 1 or gasket ring 15, can strengthen its anti-twist power, top board 8,9 can be pressed over respectively on the rubber flat plate 3,4.
As shown in Figure 1, described sealing cover is provided with and is used for the hole 16 of water into or draining even there is the water of minute quantity to enter sealing cover 2, also can discharging by this hole; Simultaneously, when generator operation as synchronous condenser is made in the power station, also can introduce secondary water by hole 16.
The utility model is installed under the operation elevation after unit is installed jiggering, to determine the setting height(from bottom) of wear-resistant ring.During work, the impeller of water turbine is subjected to the impact of water and constantly rotates, and the impeller of rotation drives main shaft 5 and rotates, and main shaft 5 drives wear-resistant ring 6,7 simultaneously and rotates.The pressure of water acts on the rubber flat plate 4 by the vent on the top board 9 10, and rubber flat plate 4 is adjacent on wear-resistant ring 7, owing to there is the gap moisture film, adds the effect of ring-like maze trough 11, has only a spot of water to enter between wear-resistant ring 7 and the rubber flat plate 3.Under gap moisture film between wear-resistant ring 6 and the rubber flat plate 3 and 11 effects of ring-like maze trough, have current hardly and advance in the sealing cover 2, thereby play the effect that reliable sealing seals.
Claims (6)
1. hydraulic turbine main shaft sealing device, comprise sealing seat (1) and be installed in the sealing cover (2) of sealing seat (1) upper end, it is characterized in that: two rubber flat plates (3,4) up and down are installed on the described sealing seat (1), main shaft (5) is gone up the corresponding two wear-resistant rings (6,7) that are equipped with and is fitted tightly with the last plane of above-mentioned two rubber flat plates (3,4) respectively, the lower plane of two rubber flat plates (3,4) is respectively equipped with top board (8,9), and the position that top board (8,9) is gone up and rubber flat plate (3,4) fits is provided with vent (10).
2. hydraulic turbine main shaft sealing device as claimed in claim 1 is characterized in that: the gap between described wear-resistant ring (6,7) and the rubber flat plate (3,4) is not more than 0.4mm.
3. hydraulic turbine main shaft sealing device as claimed in claim 1 is characterized in that: wear-resistant ring (6,7) is gone up the plane that fits with rubber flat plate (3,4) and is provided with the concentric ring-like maze trough (11) in three roads.
4. hydraulic turbine main shaft sealing device as claimed in claim 1 is characterized in that: described wear-resistant ring (6,7) is fixed on the wear-resistant ring body (12), and wear-resistant ring body (12) is installed on the main shaft (5) by axle sleeve (13).
5. hydraulic turbine main shaft sealing device as claimed in claim 1, it is characterized in that: described rubber flat plate (3,4) and top board (8,9) are installed on the sealing seat (1) by bolt (14), are provided with gasket ring (15) between rubber flat plate (4) in the middle of being positioned at and the top board (8).
6. hydraulic turbine main shaft sealing device as claimed in claim 1 is characterized in that: described sealing cover is provided with and is used for the hole (16) of water into or draining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720124568XU CN201062566Y (en) | 2007-06-26 | 2007-06-26 | Hydraulic turbine main-shaft sealing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720124568XU CN201062566Y (en) | 2007-06-26 | 2007-06-26 | Hydraulic turbine main-shaft sealing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201062566Y true CN201062566Y (en) | 2008-05-21 |
Family
ID=39450940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720124568XU Expired - Fee Related CN201062566Y (en) | 2007-06-26 | 2007-06-26 | Hydraulic turbine main-shaft sealing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201062566Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003325A (en) * | 2010-12-15 | 2011-04-06 | 兰州兰电电机有限公司 | Working sealing device for water turbine spindle |
| CN114738162A (en) * | 2022-04-27 | 2022-07-12 | 中国长江电力股份有限公司 | Work sealing structure of axial flow propeller turbine |
-
2007
- 2007-06-26 CN CNU200720124568XU patent/CN201062566Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003325A (en) * | 2010-12-15 | 2011-04-06 | 兰州兰电电机有限公司 | Working sealing device for water turbine spindle |
| CN102003325B (en) * | 2010-12-15 | 2013-03-13 | 兰州兰电电机有限公司 | Working sealing device for water turbine spindle |
| CN114738162A (en) * | 2022-04-27 | 2022-07-12 | 中国长江电力股份有限公司 | Work sealing structure of axial flow propeller turbine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 Termination date: 20110626 |