CN104454043A - Check valve for improving system transient oil pressure fluctuation process stability - Google Patents
Check valve for improving system transient oil pressure fluctuation process stability Download PDFInfo
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- CN104454043A CN104454043A CN201410468485.7A CN201410468485A CN104454043A CN 104454043 A CN104454043 A CN 104454043A CN 201410468485 A CN201410468485 A CN 201410468485A CN 104454043 A CN104454043 A CN 104454043A
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- flap
- pipeline
- check valve
- fluctuation process
- oil
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Abstract
The invention discloses a check valve for improving the system transient oil pressure fluctuation process stability. The check valve comprises a valve clack, a lower baffle, an upper baffle, a pipeline and two connecting plates. The two ends of the pipeline are connected with the two connecting plates respectively. A first through hole is formed in each connecting plate. The upper end of the valve clack is connected with the top on the inner side of the pipeline through a shaft. The lower baffle is fixed to the bottom on the inner side of the pipeline. The upper baffle is fixed to the top on the inner side of the pipeline. The upper baffle and the lower baffle are located on the two sides of the valve clack. A damping hole is formed in the side face of the valve clack. During normal working, one side of the valve clack makes contact with the upper baffle. When an oil pump stops working, the other side of the valve clack makes contact with the lower baffle, meanwhile, the structure composed of the valve clack and the lower baffle is in sealed connection with the inner side wall of the pipeline, and the two sides of the valve clack are communicated through the damping hole. According to the check valve, the safety and reliability of a water pump turbine in the oil pressure transient fluctuation process can be effectively ensured, and low-pressure safety oil pressure and building time are not affected.
Description
Technical field
The present invention relates to a kind of check valve, be specifically related to a kind of check valve improving system transients pressure fluctuation process stability.
Background technique
Along with large-scale super (super-) critical wet type cooling unit developing rapidly and the raising of domestic feed pump turbine reliability in China, the configuration of water supply system has very large different compared with in the past.By the end of super (super-) critical wet type cooling unit (adding of the operation number of units) overwhelming majority of having gone into operation now have employed steam feed pump as under declared working condition to water-driven pump, therefore the reliability of feed pump turbine is significant for guarantee unit safety reliable operation.It is for subsequent use each other that domestic a lot of unit feed pump turbine is designed to two interchange oil pumps, but the system of low pressure security personnel oil does not consider the operating mode of system short time oil-break, causes serious potential safety hazard to the operation of unit.Part of generating units adds accumulator to system, sets up accumulator and not only spends more but also change larger to system; Some Enterprises is also had to use merely the check valve oil that passes through to prevent to ensure public security to flow backwards, should the Security of interruption device under actual low fuel pressure operating mode but but sacrifice security system.
The feed pump turbine of domestic main flow can be divided into following series substantially: breathe out the little machine of vapour, the little machine of upper vapour, the east little machine of vapour and the little machine of Hangzhoupro vapour, the adjusting security system of each little machine is had nothing in common with each other, mostly adopt high pressure fireresistant oil as regulable control oil, security personnel's oil is then divided into high pressure to ensure public security oily (fire-resistant oil) or low pressure security personnel oily (selflubricating oil system communicates with emergency trip guiding valve through throttle orifice), but the lubricating oil system of each little machine is similar, the switching of lubricating pump in operation, the switching of lubricant oil oil cooler, the regular jobs such as the switching of lubricating oil strainer and the switching of security personnel's oil screen all may cause the change of oil pressure transient state.
Except part avoids because of except the abnormal tripping operation of oil pressure transient changing to sacrifice certain Security (cancellation mechanical overspeed protection control) for cost to mercury vapour turbine (eastern vapour), mostly there is the phenomenon that oil pressure transient changing causes tripping in all the other equipment, by analysis and simulation oil pump handoff procedure, observe by emergency button on the spot and cut oil pressure change procedure in pump, by test for several times, can draw to draw a conclusion: in whole pressure fluctuation process, system oil pressure all needs 3 to 4 seconds from losing to re-establish; Low pressure security personnel oil has larger fluctuation at switching oil pump moment oil pressure, and namely wave process low pressure security personnel oil is down to below chaser value less than the 1s time, and the change of lubricant oil main-piping pressure little and not fluctuation to chaser value; The fluctuation of low pressure security personnel oil causes high pressure security personnel's oil pressure change (tripping operation).
Introduced the little machine configuration of each model, except eastern vapour eliminates except mechanical overspeed protection, remaining little machine is all designed with mechanical overspeed protection, has therefore also just had low pressure to ensure public security oil in pressure fluctuation process to the impact of system.Cancellation machine surpasses protection not only has certain variation to system, most importantly sacrifices the Security of equipment, and the way of this cancellation main protection does not see precedent at home.
If head it off under reservation mechanical overspeed protection control prerequisite, common are three kinds of ways, the first then needs to increase accumulator at security personnel's oil pipe line, is set up, should selects as far as possible near the position of little machine membrane valve at the cloth of accumulator.Increase accumulator, have larger change (as shown below) to system and also from design, the bid of the system reform, be installed to finally to come into operation and need spend high expense.
Retain mechanical overspeed protection control to realize by increasing non-return flap equally.By increase by one check valve on low pressure security personnel oil pipe line, effectively can avoiding ensuring public security oil because cutting the refluence phenomenon of pump generation, the normal running of switchable pump can be realized.Increase non-return flap and have shortcoming equally; if emergency bearing oil pump fault in the process switching oil pump; lubrication pressure is low to moderate trip value really; then equipment can only realize blocking by other protection; because the pressure maintaining effect of non-return flap, cannot proterctive equipment safety under the operating mode that low pressure security personnel oil loses at lubrication pressure.
A kind of last method is two lubricating pumps and pump operation, when any oil pump is stopped transport because of a variety of causes, and the other safety that can ensure equipment.Feed pump turbine lubricating pump paired running, an operation of oil pump must be had at the unstable region of low discharge, long-term operation in this mode must cause the cavitation damage of fuel pump impeller, accelerates the damage time of oil pump, wastes unnecessary station service in addition.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of check valve improving system transients pressure fluctuation process stability, this check valve effectively can ensure safe, reliable in oil pressure transient wave process of water pump steam turbine, and does not affect oil pressure and the building-up time of low pressure security personnel oil.
For achieving the above object, the check valve of raising system transients pressure fluctuation process stability of the present invention comprises flap, lower pedal, overhead gage, pipeline and two connecting plates, the two ends of pipeline are connected with two connecting plates respectively, connecting plate offers the first through hole, the upper end of flap is connected by axle with the top of insides of pipes, lower pedal is fixed on the bottom of insides of pipes, overhead gage is fixed on the top of insides of pipes, overhead gage and lower pedal are positioned at the both sides of flap, the side of flap is provided with damping hole, during normal work, the side of flap contacts with overhead gage, when oil pump quits work, the opposite side of flap contacts with lower pedal, and the madial wall of the structure that forms of flap and lower pedal and pipeline is tightly connected, the both sides of flap are connected by damping hole.
Also comprise the externally threaded fastening piece of band, damping hole is opened on fastening piece, and the side opening of flap is provided with the second through hole, and the inwall of the second through hole is provided with the internal thread matched with described outside thread.Described fastening piece is screw.
Stating connecting plate is flanged surface.
The diameter of described damping hole is 0.8-2mm.
When oil pump normally works, the angle of flap and overhead gage is 15 °-30 °.
Fig. 1 is sectional view of the present invention;
Fig. 2 is the sectional view of flap 2 in the present invention.
Wherein, 1 be connecting plate, 2 be flap, 3 be pipeline, 4 be lower pedal, 5 be axle, 6 be fastening piece, 7 be damping hole, 8 for overhead gage.
With reference to figure 1 and Fig. 2, the check valve of raising system transients pressure fluctuation process stability of the present invention comprises flap 2, lower pedal 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, connecting plate 1 offers the first through hole, the upper end of flap 2 is connected by axle 5 with the top inside pipeline 3, lower pedal 4 is fixed on the bottom inside pipeline 3, overhead gage 8 is fixed on the top inside pipeline 3, overhead gage 8 and lower pedal 4 are positioned at the both sides of flap 2, the side of flap 2 is provided with damping hole 7, during normal work, the side of flap 2 contacts with overhead gage 8, when oil pump quits work, the opposite side of flap 2 contacts with lower pedal 4, and the madial wall of the structure that forms of flap 2 and lower pedal 4 and pipeline 3 is tightly connected, the both sides of flap 2 are connected by damping hole 7.
It should be noted that, the present invention also comprises the externally threaded fastening piece 6 of band, and damping hole 7 is opened on fastening piece 6, and the side opening of flap 2 is provided with the second through hole, and the inwall of the second through hole is provided with the internal thread matched with described outside thread.Fastening piece 6 is screw, and connecting plate 1 is flanged surface, and the diameter of damping hole 7 is 0.8-2mm.When oil pump normally works, flap 2 is 15 °-30 ° with the angle of overhead gage 8.
Working procedure of the present invention is:
During use, between the oil outlet that the check valve of raising system transients pressure fluctuation process stability of the present invention is arranged at oil pump and emergency governor, overspeed governor, when oil pump normally works, flap 2 contacts with overhead gage 8 under the drive of oil, the oil that oil pump exports enters into emergency governor, overspeed governor through pipeline 3, when in the out-of-work process of oil pump, the oil pressure at oil pump oil outlet place reduces instantaneously, the oil pressure at oil pump oil outlet place is made to be less than oil pressure in emergency governor, overspeed governor, thus flap 2 is contacted with lower pedal 4, after flap 2 contacts with lower pedal 4, the oil of emergency governor, overspeed governor side enters into oil pump side through damping hole 7, thus when ensureing pressure fluctuation in preset time period low pressure security personnel oil normal, after exceeding described preset time period, then think lubricating oil system fault, thus interdict main equipment by low pressure oily decompression of ensuring public security, and then under the oil pressure not affecting low pressure security personnel oil and the prerequisite of building-up time, ensure that the safety of water pump steam turbine in oil pressure transient wave process is with reliable.
Claims (6)
1. one kind is improved the check valve of system transients pressure fluctuation process stability, it is characterized in that, comprise flap (2), lower pedal (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, (1) offers the first through hole to connecting plate, the upper end of flap (2) is connected by axle (5) with the top of pipeline (3) inner side, lower pedal (4) is fixed on the bottom of pipeline (3) inner side, overhead gage (8) is fixed on the top of pipeline (3) inner side, overhead gage (8) and lower pedal (4) are positioned at the both sides of flap (2), the side of flap (2) is provided with damping hole (7), during normal work, the side of flap (2) contacts with overhead gage (8), when oil pump quits work, the opposite side of flap (2) contacts with lower pedal (4), and the madial wall of the structure that forms of flap (2) and lower pedal (4) and pipeline (3) is tightly connected, the both sides of flap (2) are connected by damping hole (7).
2. the check valve of raising system transients pressure fluctuation process stability according to claim 1, it is characterized in that, also comprise the externally threaded fastening piece of band (6), damping hole (7) is opened on fastening piece (6), the side opening of flap (2) is provided with the second through hole, and the inwall of the second through hole is provided with the internal thread matched with described outside thread.
3. the check valve of raising system transients pressure fluctuation process stability according to claim 2, it is characterized in that, described fastening piece (6) is screw.
4. the check valve providing system transients pressure fluctuation process stability according to claim 1, is characterized in that, described connecting plate (1) is flanged surface.
5. the check valve of raising system transients pressure fluctuation process stability according to claim 1, is characterized in that, the diameter of described damping hole (7) is 0.8-2mm.
6. the check valve of raising system transients pressure fluctuation process stability according to claim 1, is characterized in that, when oil pump normally works, flap (2) is 15 °-30 ° with the angle of overhead gage (8).
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104454043A true CN104454043A (en) | 2015-03-25 |
| CN104454043B CN104454043B (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 (5)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1352138A1 (en) * | 1986-01-13 | 1987-11-15 | Предприятие П/Я А-7899 | Check valve |
-
2014
- 2014-09-15 CN CN201410468485.7A patent/CN104454043B/en active Active
Patent Citations (5)
| 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 |
| 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 |
|---|---|
| CN104454043B (en) | 2016-05-11 |
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