CN104454043B - A kind of non-return valve that improves system transients pressure fluctuation process stability - Google Patents
A kind of non-return valve that improves system transients pressure fluctuation process stability Download PDFInfo
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- CN104454043B CN104454043B CN201410468485.7A CN201410468485A CN104454043B CN 104454043 B CN104454043 B CN 104454043B CN 201410468485 A CN201410468485 A CN 201410468485A CN 104454043 B CN104454043 B CN 104454043B
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- baffle plate
- lower baffle
- pipeline
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Abstract
The invention discloses a kind of non-return valve that improves system transients pressure fluctuation process stability, comprise flap, lower baffle plate, overhead gage, pipeline and two connecting plates, the two ends of pipeline are connected with two connecting plates respectively, on connecting plate, offer the first through hole, the upper end of flap is connected by axle with the top of insides of pipes, lower baffle plate is fixed on the bottom of insides of pipes, overhead gage is fixed on the top of insides of pipes, overhead gage and lower baffle plate are positioned at the both sides of flap, the side of flap is provided with damping hole, when normal work, one side of flap contacts with overhead gage, in the time that oil pump quits work, the opposite side of flap contacts with lower baffle plate, and the structure of flap and lower baffle plate composition and the madial wall of pipeline are tightly connected, the both sides of flap are connected by damping hole. the present invention can effectively ensure safe, reliable in oil pressure transient wave process of water pump steam turbine, and does not affect low pressure and ensure public security oily oil pressure and Time Created.
Description
Technical field
The present invention relates to a kind of non-return valve, be specifically related to a kind of system transients pressure fluctuation process that improvesThe non-return valve of stability.
Background technology
Along with the clammy unit of large-scale super (super-) critical developing rapidly and domestic feed pump in ChinaThe raising of steam turbine reliability, the configuration of water supply system from compared in the past had very large different. CutThe absolutely large portion of the clammy unit of super (super-) critical (adding of operation number of units) of only having gone into operation till nowPoint adopted steam feed pump as under declared working condition to water-driven pump, therefore feed pump turbineReliability for ensureing that unit safety reliability service is significant. Domestic a lot of unit feedwaterIt is for subsequent use each other that mercury vapour turbine is designed to two interchange oil pumps, but low pressure is ensured public security, oily system is notThe operating mode of taking into account system short time oil-break, has caused serious potential safety hazard to the operation of unit. PortionExtension set group has increased accumulator to system, sets up accumulator and not only spends more but also system is changedLarger; Also have Some Enterprises to use merely non-return valve by preventing the oil refluence of ensuring public security, but but sacrificeThe security system security that should interdict equipment under actual low oil pressure operating mode.
The feed pump turbine of domestic main flow can be divided into following series substantially: breathe out vapour little machine, onThe little machine of vapour, the little machine of eastern vapour and the little machine of Hangzhoupro vapour, the adjusting security system of each little machine is had nothing in common with each other, largeAll adopt high pressure fireresistant oil to control oil as regulating, security personnel's oil is divided into high pressure security personnel's oil (fire resistant oil)Or low pressure security personnel's oil (self-lubricating oil system communicates with emergency trip guiding valve through throttle orifice), butThe lubricating oil system of each little machine is similar, the switching of grease pump in service, lubricating oil oil coolerThe regular job such as the switching of switching, lubricating oil strainer and the switching of security personnel's oil screen all may leadCause the variation of oil pressure transient state.
Except part gives mercury vapour turbine (eastern vapour) to sacrifice certain security (cancellation mechanical overspeed protection control)Having avoided because of outside the abnormal tripping operation of oil pressure transient changing for cost, mostly there is oil pressure wink in all the other equipmentState changes the phenomenon that causes tripping operation, by analysis and the handoff procedure of simulation oil pump, and on the spot by thingTherefore button is observed and is cut oil pressure change procedure in pump, tests by several, can draw to draw a conclusion: wholeIn individual pressure fluctuation process, system oil pressure all needs 3 to 4 seconds from losing to re-establish; Low pressureSecurity personnel's oil has larger fluctuation at switching oil pump moment oil pressure, and wave process low pressure security personnel oil is less than 1sTime be down to below chaser value, and the variation of lubricating oil main-piping pressure not quite and is not fluctuateed to chaserValue; The low pressure oily fluctuation of ensuring public security causes high pressure security personnel oil pressure to change (tripping operation).
Introduce the little machine configuration of each model, except eastern vapour has been cancelled mechanical overspeed protection, remainingLittle machine is all designed with mechanical overspeed protection, has therefore also just had low pressure security personnel oil in pressure fluctuation processIn impact on system. The super protection of cancellation machine not only has certain variation to system, most importantlySacrificed the security of equipment, the way of this cancellation main protection is not seen precedent at home.
If retaining head it off under mechanical overspeed protection control prerequisite, common are three kinds of ways, the firstNeed to increase accumulator at security personnel's oil pipe line, be set up at the cloth of accumulator, should select as far as possible closeThe position of little machine diaphragm valve. Increase accumulator, system is had to larger change (as shown below)And from design, the bid of the system reform, be installed to finally to come into operation and need the high expense of costWith.
Retaining mechanical overspeed protection control can realize by increasing non-return flap equally. At low pressure security personnel oil pipe lineUpper by increasing by one non-return valve, the oily refluence phenomenon occurring because cutting pump of can effectively avoiding ensuring public security,Can realize the normal operating of switchable pump. Increasing non-return flap has shortcoming equally, if switching oil pumpProcess in emergency bearing oil pump fault, lubrication pressure is low to moderate trip value really, equipment can only be by notProtection realize blocking because the pressure maintaining effect of non-return flap, low pressure security personnel oil loses at lubrication pressureOperating mode under cannot protect device security.
A kind of last method is two grease pumps pump operation, when any oil pump is because of variousWhen reason is stopped transport, the other safety that can ensure equipment. Feed pump turbine grease pump alsoRow operation, must have the unstable region of an operation of oil pump at low discharge, for a long time under whichOperation must cause the cavitation damage of fuel pump impeller, has accelerated the damage time of oil pump, in addition waveTake unnecessary station service.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of raising system is providedThe non-return valve of transient state pressure fluctuation process stability, this check (non-return) valve can effectively ensure water pump steamerSafe, reliable in oil pressure transient wave process of machine, and do not affect the low pressure oily oil pressure of ensuring public securityAnd Time Created.
For achieving the above object, raising system transients pressure fluctuation process stability of the present inventionNon-return valve comprise flap, lower baffle plate, overhead gage, pipeline and two connecting plates, the two ends of pipelineBe connected with two connecting plates respectively, on connecting plate, offer the first through hole, the upper end of flap and pipeThe top of inner side, road connects by axle, and lower baffle plate is fixed on the bottom of insides of pipes, and overhead gage is fixedIn the top of insides of pipes, overhead gage and lower baffle plate are positioned at the both sides of flap, and the side of flap is provided withDamping hole, while normally work, a side of flap contacts with overhead gage, in the time that oil pump quits work,The opposite side of flap contacts with lower baffle plate, and the structure of flap and lower baffle plate composition and pipeline inSidewall is tightly connected, and the both sides of flap are connected by damping hole.
Also comprise and be with externally threaded securing member, damping hole is opened on securing member, the side opening of flapBe provided with the second through hole, the inwall of the second through hole is provided with the internal thread matching with described external screw thread.
Described securing member is screw.
Stating connecting plate is flange face.
The diameter of described damping hole is 0.8-2mm.
In the time that oil pump is normally worked, the angle of flap and overhead gage is 15 °-30 °.
The present invention has following beneficial effect:
The non-return valve of raising system transients pressure fluctuation process stability of the present invention was being workedCheng Zhong, by the non-return valve setting of raising system transients pressure fluctuation process stability of the present inventionBetween the oil-out and emergency governor, overspeed governor of oil pump, when oil pump is normally worked, flap and overhead gage connectTouch, oil enters into emergency governor, overspeed governor by pipeline, when in the out-of-work process of oil pump, and oil pumpThe pressure moment at oil-out place reduces, and flap is contacted, the oil in emergency governor, overspeed governor with lower baffle plateEnter into oil pump oil-out place through damping hole, thus low in Preset Time section while ensureing pressure fluctuationPress security personnel's oil normal, when exceeding after described Preset Time section, think that lubricating oil system breaks down,Thereby interdict main equipment by the low pressure oily decompression of ensuring public security, and then do not affecting the low pressure oily oil of ensuring public securityUnder the prerequisite of pressure and Time Created, ensure the safety of water pump steam turbine in oil pressure transient wave processReliably, and simple in structure, and cost is low.
Brief description of the drawings
Fig. 1 is sectional view of the present invention;
Fig. 2 is the sectional view of flap 2 in the present invention.
Wherein, 1 is that connecting plate, 2 is that flap, 3 is that pipeline, 4 is that lower baffle plate, 5 is axle, 6For securing member, 7 is that damping hole, 8 is overhead gage.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1 and Fig. 2, raising system transients pressure fluctuation process stability of the present inventionNon-return valve comprise flap 2, lower baffle plate 4, overhead gage 8, pipeline 3 and two connecting plates 1, pipeThe two ends in road 3 are connected with two connecting plates 1 respectively, offer the first through hole on connecting plate 1,The upper end of flap 2 is connected by axle 5 with the top of pipeline 3 inner sides, and lower baffle plate 4 is fixed on pipelineThe bottom of 3 inner sides, overhead gage 8 is fixed on the top of pipeline 3 inner sides, overhead gage 8 and lower baffle plate 4Be positioned at the both sides of flap 2, the side of flap 2 is provided with damping hole 7, while normally work, and flap 2A side contact with overhead gage 8, in the time that oil pump quits work, the opposite side of flap 2 and lower blockPlate 4 contacts, and the madial wall sealing company of the structure that forms of flap 2 and lower baffle plate 4 and pipeline 3Connect, the both sides of flap 2 are connected by damping hole 7.
It should be noted that, the present invention also comprises and is with externally threaded securing member 6, and damping hole 7 is offeredOn securing member 6, the side opening of flap 2 is provided with the second through hole, the inwall of the second through hole be provided withThe internal thread that described external screw thread matches. Securing member 6 is screw, and connecting plate 1 is flange face, resistanceThe diameter in Buddhist nun hole 7 is 0.8-2mm. In the time that oil pump is normally worked, the folder of flap 2 and overhead gage 8Angle is 15 °-30 °.
The course of work of the present invention is:
When use, by the check of raising system transients pressure fluctuation process stability of the present inventionValve is arranged between the oil-out and emergency governor, overspeed governor of oil pump, in the time that oil pump is normally worked, and flap 2Under oily drive, contact with overhead gage 8, the oil of oil pump output enters into critical screening through pipeline 3In disconnected device, when in the out-of-work process of oil pump, the oil pressure moment at oil pump oil-out place reduces, and makesThe oil pressure at oil pump oil-out place is less than the oil pressure in emergency governor, overspeed governor, thereby makes flap 2 and lower baffle plate4 contact, and after flap 2 contacts with lower baffle plate 4, the oil of emergency governor, overspeed governor one side is through damping hole 7Enter into oil pump one side, thereby ensure when pressure fluctuation that low pressure security personnel oil is normal in Preset Time section,When exceeding after described Preset Time section, think lubricating oil system fault, thereby ensure public security by low pressureOil decompression interdict main equipment, and then do not affect low pressure ensure public security oily oil pressure and Time Created beforePut, ensure that the safety of water pump steam turbine in oil pressure transient wave process is with reliable.
Claims (4)
1. a non-return valve that improves system transients pressure fluctuation process stability, is characterized in that,Comprise flap (2), lower baffle plate (4), overhead gage (8), pipeline (3) and two connecting plates (1),The two ends of pipeline (3) are connected with two connecting plates (1) respectively, and two connecting plates (1) are all upperOffer the first through hole, the top of the upper end of flap (2) and pipeline (3) inner side is by axle (5)Connect, lower baffle plate (4) is fixed on the bottom of pipeline (3) inner side, and overhead gage (8) is fixed on pipeThe top of inner side, road (3), overhead gage (8) and lower baffle plate (4) are positioned at the both sides of flap (2),The side of flap (2) is provided with damping hole (7), while normally work, and a side of flap (2) and upper gearPlate (8) contacts, in the time that oil pump quits work, and the opposite side of flap (2) and lower baffle plate (4)Contact, and flap (2) is close with the structure of lower baffle plate (4) composition and the madial wall of pipeline (3)Envelope connects, and the both sides of flap (2) are connected by damping hole (7);
Also comprise and be with externally threaded securing member (6), damping hole (7) to be opened in securing member (6) above,The side opening of flap (2) is provided with the second through hole, and the inwall of the second through hole is provided with and described external screw thread phaseThe internal thread coordinating;
Two described connecting plates (1) are flange face.
2. the check of raising system transients pressure fluctuation process stability according to claim 1Valve, is characterized in that, described securing member (6) is screw.
3. the check of raising system transients pressure fluctuation process stability according to claim 1Valve, is characterized in that, the diameter of described damping hole (7) is 0.8-2mm.
4. the check of raising system transients pressure fluctuation process stability according to claim 1Valve, is characterized in that, in the time that oil pump is normally worked, flap (2) with the angle of overhead gage (8) is15°-30°。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410468485.7A CN104454043B (en) | 2014-09-15 | 2014-09-15 | A kind of non-return valve that improves system transients pressure fluctuation process stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410468485.7A CN104454043B (en) | 2014-09-15 | 2014-09-15 | A kind of non-return valve that improves system transients pressure fluctuation process stability |
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| Publication Number | Publication Date |
|---|---|
| CN104454043A CN104454043A (en) | 2015-03-25 |
| CN104454043B true CN104454043B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410468485.7A Active CN104454043B (en) | 2014-09-15 | 2014-09-15 | A kind of non-return valve that improves system transients pressure fluctuation process stability |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091536A (en) * | 1964-08-28 | 1967-11-15 | Anglo Belge Vulcain Sa Soc | Improvements relating to fluid flow control valves |
| GB1214619A (en) * | 1968-02-26 | 1970-12-02 | Yoshio Kajita | Check valve |
| US4095534A (en) * | 1977-02-16 | 1978-06-20 | Foster Wheeler Energy Corporation | Damper with curved extension plates for wide range flow control |
| SU1352138A1 (en) * | 1986-01-13 | 1987-11-15 | Предприятие П/Я А-7899 | Check valve |
| CN102102690A (en) * | 2011-04-01 | 2011-06-22 | 马鞍山科瑞达机械制造有限公司 | Wet solenoid directional valve capable of relieving hydraulic directional impact |
| CN204267104U (en) * | 2014-09-15 | 2015-04-15 | 西安热工研究院有限公司 | A kind of check valve improving system transients pressure fluctuation process stability |
-
2014
- 2014-09-15 CN CN201410468485.7A patent/CN104454043B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091536A (en) * | 1964-08-28 | 1967-11-15 | Anglo Belge Vulcain Sa Soc | Improvements relating to fluid flow control valves |
| GB1214619A (en) * | 1968-02-26 | 1970-12-02 | Yoshio Kajita | Check valve |
| US4095534A (en) * | 1977-02-16 | 1978-06-20 | Foster Wheeler Energy Corporation | Damper with curved extension plates for wide range flow control |
| SU1352138A1 (en) * | 1986-01-13 | 1987-11-15 | Предприятие П/Я А-7899 | Check valve |
| CN102102690A (en) * | 2011-04-01 | 2011-06-22 | 马鞍山科瑞达机械制造有限公司 | Wet solenoid directional valve capable of relieving hydraulic directional impact |
| CN204267104U (en) * | 2014-09-15 | 2015-04-15 | 西安热工研究院有限公司 | A kind of check valve improving system transients pressure fluctuation process stability |
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| Publication number | Publication date |
|---|---|
| CN104454043A (en) | 2015-03-25 |
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