CN201908980U - Single-piston three-cavity pneumatic restoring type brake - Google Patents
Single-piston three-cavity pneumatic restoring type brake Download PDFInfo
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- CN201908980U CN201908980U CN2011200509282U CN201120050928U CN201908980U CN 201908980 U CN201908980 U CN 201908980U CN 2011200509282 U CN2011200509282 U CN 2011200509282U CN 201120050928 U CN201120050928 U CN 201120050928U CN 201908980 U CN201908980 U CN 201908980U
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- piston
- piston cylinder
- runddichtringo
- seal ring
- break
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Abstract
The utility model discloses a single-piston three-cavity pneumatic restoring type brake, which belongs to the technical field of the braking of hydroelectric generating sets and mainly solves the problems of brakes in the prior art, i.e. unstable sealing ring performance and easy air leakage between the upper and the lower cavities. The brake comprises a piston cylinder in which a piston is arranged, a braking mechanism connected with the piston is arranged on the upper end of the piston cylinder, a bushing is arranged between the piston and the piston cylinder, the upper end of the bushing is connected with the piston cylinder through a bushing-fixing plate, sealing rings are respectively arranged between the bushing and the piston as well as between the piston and the piston cylinder, the piston cylinder is also provided with a locking mechanism, and an isolating cavity which communicates with the outside atmosphere is also arranged between the piston and the piston cylinder. Forked sealing rings, such as Y-shaped sealing rings, are also added in the brake. Since the structure of the brake is ingenuously designed, the sealing property is greatly enhanced, the air leakage between the upper and the lower cavities of the brake is effectively prevented as well, and thereby the good operating performance of the brake is guaranteed.
Description
Technical field
The utility model relates to a kind of break, specifically, relates to a kind of pneumatic homing position type break in single piston three chambeies that is used for the hydroelectric power unit.
Background technique
Break (being commonly called as air lock) is the core component of hydroelectric power unit braking system, its structure mainly comprises the piston cylinder of being with piston, and the keep plate of piston cylinder top, under piston jack-up keep plate and reset mode, piston base will and piston cylinder between form a cavity, hereinafter to be referred as cavity of resorption, and also will form a cavity between piston head and the keep plate, hereinafter to be referred as epicoele.Break mainly contains braking and two functions of jack-up in hydroelectric power unit working procedure: 1. in the compressor emergency shutdown process, when rotating speed drops to than the slow-speed of revolution, the rapid jack-up of piston in the break, braking adds lock, avoiding unit to move under the slow-speed of revolution for a long time causes thrust bearing shoe valve and guide bearing block to damage because of dry friction, after this under the compressor emergency shutdown stand-by state, break keeps braking to add the lock state, avoids causing the unit wriggling because of stator leaks; 2. in the unit start process, break the important basis for estimation of declutching that resets into unit start flow process, after this under the set grid-connection generating state, the break hold reset state that declutches, unit is able to freely rotate under hydraulic action.In addition,, pump into hydraulic oil to the cavity of resorption of break, can be used as the jack stand rotor with high pressure oil pump in the unit installation or between turn(a)round.
At present, the break that generally adopts of domestic and international large-scale hydroelectric power unit is the pneumatic homing position type break of single piston two-chamber.The pneumatic homing position type break of existing this single piston two-chamber mainly exists following problem or defective: the pneumatic homing position type break of single piston two-chamber generally adopts circular seal ring, and circular seal ring is easy to make its sealability to reduce because of being squeezed for a long time, wearing and tearing, and then causes the epicoele of break and cavity of resorption to be collaborated.In the unit start process, when the epicoele of break is connected pressurized air, when cavity of resorption is connected atmosphere, the break epicoele pressurized air that the part sealability is not good enough will seal in cavity of resorption, be subjected to the restriction of control electromagnetic valve latus rectum especially automatically of long pipe runs system exhaust ability, will there be certain residual voltage inevitably in cavity of resorption, and since the circular area of cavity of resorption much larger than the annulus area (being generally 2～3 times) of epicoele, therefore act on the piston lower end pressure will with the pressure that acts on the upper end quite even can be slightly larger than the pressure that acts on the upper end, in addition, owing to be subjected to the influence of surface friction drag, will cause part even whole break to reset.This problem will directly influence unit starting up speed and Auto Power On success rate, cause the standby unit of shutdown need in time generate electricity by way of merging two or more grid systems by system.
The model utility content
The purpose of this utility model is to provide a kind of single piston three chambeies pneumatic homing position type break, solves problems of the prior art, avoids the air of break epicoele directly to seal in cavity of resorption, guarantees that cavity of resorption air pressure is zero, guarantees that break resets smoothly.
To achieve these goals, the technical solution adopted in the utility model is as follows:
The pneumatic homing position type break in a kind of single piston three chambeies, comprise the piston cylinder that is built-in with piston, this piston cylinder upper end is provided with the braking device that is connected with piston, between piston and piston cylinder, be provided with lining, this lining upper end is connected with piston cylinder by the lining fixed plate, is respectively arranged with seal ring between any two at lining, piston, piston cylinder, also is provided with locking device on piston cylinder, it is characterized in that, also be provided with the separate cavities that is communicated with ambient atmosphere between described piston and the piston cylinder.
Further, described separate cavities is made of piston cylinder inwall and the annular recess that is arranged on the piston side wall, then is provided with the through hole that is communicated with this separate cavities and ambient atmosphere on this piston cylinder sidewall.
Further, described through hole is right against groove, and its trend is parallel with the piston cylinder bottom surface.
In order to improve sealability, in the utility model, the set-up mode of seal ring comprises following two kinds: one. described seal ring is circular seal ring or dichotomous seal ring, and the quantity of dichotomous seal ring is at least one.Described dichotomous seal ring is " Y " RunddichtringO, " U " RunddichtringO, " V " RunddichtringO, " X " RunddichtringO or " Yx " RunddichtringO.Two. described seal ring is dichotomous seal ring.Described dichotomous seal ring is " Y " RunddichtringO, " U " RunddichtringO, " V " RunddichtringO, " X " RunddichtringO or " Yx " RunddichtringO.
Again further, described braking device comprises the braking panel seat, and is positioned at braking panel seat upper end and chimeric with it keep plate.Fixedly connected with the braking panel seat by bolt in described piston upper end.
Compared with prior art, the utlity model has following beneficial effect:
1. the utility model design is ingenious, simple in structure, easy to operate.
2. the utility model is by setting up groove on piston side wall, and form cavity jointly with the piston cylinder madial wall, be communicated with ambient air by the through hole that is arranged on the piston cylinder sidewall then, under this set, even if seal failure also can be avoided occurring collaborating between the upper and lower cavity of break.
3. the utility model is on the basis of existing circular seal ring, set up dichotomous seal ring again as standby, before sealing effect after not only having guaranteed to improve is not less than improvement, also further improved sealing effect: when the seal ring pressurized, the branch of dichotomous seal ring will be close on the sidewall of piston cylinder and piston, thereby prevent the gas leakage of upper and lower chamber effectively, avoid the interior residual gas of cavity of resorption that piston is produced pressure, hinder break and reset.
4. preferred " Y " RunddichtringO of the utility model can guarantee effectively when break resets that its branch fits tightly on piston cylinder, piston side wall, and when the break braking brake, withdraw again in the sealed groove, avoid being squeezed, wearing and tearing, thereby both guaranteed sealing effect, prolonged the working life of seal ring again, the use value of break is improved greatly.
5. by monitoring to each cavity exhaust situation of break, can in time grasp the situation of collaborating between each cavity, and pass through the optionally valve of each cavity jointing of switch break, can realize quick location, thereby reach the purpose that improves maintenance, maintenance efficiency the fault point.
Description of drawings
Fig. 1 is the structural representation of break reset mode in the prior art.
Fig. 2 is the structural representation of break jack-up state in the prior art.
Fig. 3 is the structural representation of seal ring in the prior art.
Fig. 4 is the structural representation of break reset mode in the utility model.
Fig. 5 is the structural representation of break jack-up state in the utility model.
Fig. 6 is the structural representation of " Y " RunddichtringO in the utility model.
In the above-mentioned accompanying drawing, the name of reference character correspondence is called: the 1-keep plate, 2-brakes panel seat, 3-lining fixed plate, 4-locking device, 5-lining, 6-piston cylinder, 7-piston, 8-circular seal ring, 9-" Y " RunddichtringO, 10-separate cavities, 11-through hole.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, and protection domain of the present utility model includes but not limited to following embodiment.
The working state of existing break such as Fig. 1～shown in Figure 3, in Fig. 1 and Fig. 2 as can be seen, not only there are not other can be communicated with the structure of outside atmosphere between the epicoele of break and the cavity of resorption, and seal ring also is circular seal ring fully, therefore, be damaged when causing sealability to reduce at seal ring, the gas of epicoele may directly seal in cavity of resorption, cause the cavity of resorption residual gas that piston is formed pressure, hinder break and reset.And in the working procedure of hydroelectric power unit braking system, in a single day break can't reset smoothly, will produce very serious consequence.
Embodiment
As Fig. 4～shown in Figure 6, the pneumatic homing position type break in a kind of single piston three chambeies, comprise the piston cylinder 6 that is built-in with piston 7, these piston cylinder 6 upper ends are provided with the braking device of fixedlying connected with piston 7, between piston 7 and piston cylinder 6, be provided with lining 5, these lining 5 upper ends are connected with piston cylinder 6 by lining fixed plate 3, at piston 7 and piston cylinder 6, piston 7 and lining 5, also be respectively arranged with circular seal ring and " Y " RunddichtringO between lining 5 and the piston cylinder 6, on piston cylinder 6 outer walls, also be provided with locking device 4, also be provided with the separate cavities 10 that is communicated with piston cylinder 6 ambient atmosphere between described piston 7 and the piston cylinder 6, separate cavities 10 over against piston cylinder 6 sidewalls be provided with through hole 11, utilize this through hole 11, just realized being communicated with of separate cavities 10 and ambient atmosphere.
In the break reseting procedure, the epicoele of break feeds pressurized air, cavity of resorption then is communicated with ambient atmosphere, by pressurized air in the epicoele piston 7 is produced downward thrust, piston 7 is moved downward, reset until break and to finish, the air in the cavity of resorption is got rid of fully to the piston cylinder atmosphere outside, and break resets to declutch and finishes.In this course, the sealability of seal ring has guaranteed that epicoele has good air-tightness, and then guaranteed that epicoele pressurized air forms downward thrust to piston 7 effectively, simultaneously, the existence of separate cavities 10, guaranteed that further the pressurized air in the epicoele can't directly seal in cavity of resorption, cause producing in the cavity of resorption active force upwards, hindering piston 7 moves downward, its principle is: if there is sealing ring tightness energy condition of poor in the epicoele bottom, the pressurized air of Guo Louing will directly enter atmosphere by separate cavities 10 thus.
Add in the piston 7 jack-up processes of lock in the break braking, the epicoele of break is communicated with ambient atmosphere, and cavity of resorption is communicated with pressurized air, pressurized air enters after the cavity of resorption, piston 7 is produced active force upwards, piston 7 is moved upward rapidly, and utilize piston 7 and the annexation of braking panel seat 2, jack-up keep plate 1 is finished braking and is added lock work.In this course, the sealability of seal ring directly has influence on the amount of force that piston is subjected to, if sealability is too poor, can't guarantee keep plate to the enough contact pressures of formation between the rotor wearing plate, facing plate of its top, even can't the jack-up keep plate.The utility model is in the circular seal ring 8 that adopts prior art, also set up " Y " RunddichtringO 9, because the branch of " Y " RunddichtringO 9 can be close on the sidewall of piston cylinder 6, piston 7 fully, therefore, the sealability of seal ring has guaranteed that cavity of resorption has good air-tightness, and then has guaranteed the active force of the interior pressurized air of cavity of resorption to piston.
In the utility model, " Y " RunddichtringO 9 can be replaced with other seal rings with branch, and as " U " RunddichtringO, " V " RunddichtringO, " X " RunddichtringO or " Yx " RunddichtringO, and the quantity of seal ring also can be determined according to actual needs.
According to the foregoing description, just can realize the utility model well.
Claims (9)
1. pneumatic homing position type break in single piston three chambeies, comprise the piston cylinder (6) that is built-in with piston (7), this piston cylinder (6) upper end is provided with the braking device that is connected with piston (7), between piston (7) and piston cylinder (6), be provided with lining (5), this lining (5) upper end is connected with piston cylinder (6) by lining fixed plate (3), in lining (5), piston cylinder (6), piston (7) is respectively arranged with seal ring between any two, on piston cylinder (6), also be provided with locking device (4), it is characterized in that, also be provided with the separate cavities (10) that is communicated with ambient atmosphere between described piston (7) and the piston cylinder (6).
2. the pneumatic homing position type break in a kind of single piston three chambeies according to claim 1, it is characterized in that, described separate cavities (10) is made of piston cylinder (6) inwall and the annular recess that is arranged on piston (7) sidewall, also is provided with the through hole (11) that is communicated with this separate cavities and ambient atmosphere on this piston cylinder (6) sidewall.
3. the pneumatic homing position type break in a kind of single piston three chambeies according to claim 2 is characterized in that described through hole (11) is right against groove, and its trend is parallel with piston cylinder (6) bottom surface.
4. according to the pneumatic homing position type break of claim 1 or 2 or 3 described a kind of single piston three chambeies, it is characterized in that described seal ring is circular seal ring (8) or dichotomous seal ring, and the quantity of dichotomous seal ring is at least one.
5. the pneumatic homing position type break in a kind of single piston three chambeies according to claim 4, it is characterized in that described dichotomous seal ring is " Y " RunddichtringO (9), " U " RunddichtringO, " V " RunddichtringO, " X " RunddichtringO or " Yx " RunddichtringO.
6. according to the pneumatic homing position type break of claim 1 or 2 or 3 described a kind of single piston three chambeies, it is characterized in that described seal ring is dichotomous seal ring.
7. the pneumatic homing position type break in a kind of single piston three chambeies according to claim 6, it is characterized in that described dichotomous seal ring is " Y " RunddichtringO (9), " U " RunddichtringO, " V " RunddichtringO, " X " RunddichtringO or " Yx " RunddichtringO.
8. according to the pneumatic homing position type break of claim 5 or 7 described a kind of single piston three chambeies, it is characterized in that described braking device comprises braking panel seat (2), and be positioned at braking panel seat (2) upper end and chimeric with it keep plate (1).
9. the pneumatic homing position type break in a kind of single piston three chambeies according to claim 8 is characterized in that, fixedlys connected with braking panel seat (2) by bolt in described piston (7) upper end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200509282U CN201908980U (en) | 2011-03-01 | 2011-03-01 | Single-piston three-cavity pneumatic restoring type brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200509282U CN201908980U (en) | 2011-03-01 | 2011-03-01 | Single-piston three-cavity pneumatic restoring type brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201908980U true CN201908980U (en) | 2011-07-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200509282U Expired - Lifetime CN201908980U (en) | 2011-03-01 | 2011-03-01 | Single-piston three-cavity pneumatic restoring type brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201908980U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965589A (en) * | 2017-11-21 | 2018-04-27 | 江苏通用科技股份有限公司 | A kind of forming machine rotary valve device with defencive function of collaborating |
-
2011
- 2011-03-01 CN CN2011200509282U patent/CN201908980U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965589A (en) * | 2017-11-21 | 2018-04-27 | 江苏通用科技股份有限公司 | A kind of forming machine rotary valve device with defencive function of collaborating |
| CN107965589B (en) * | 2017-11-21 | 2020-09-15 | 江苏通用科技股份有限公司 | Make-up machine changes valve gear with gas leakage protect function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110727 |