CN103851323B - A kind of lubricating oil system of nuclear power plant concrete volute pump - Google Patents
A kind of lubricating oil system of nuclear power plant concrete volute pump Download PDFInfo
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- CN103851323B CN103851323B CN201410058540.5A CN201410058540A CN103851323B CN 103851323 B CN103851323 B CN 103851323B CN 201410058540 A CN201410058540 A CN 201410058540A CN 103851323 B CN103851323 B CN 103851323B
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Abstract
The present invention relates to the lubricating oil system of a kind of nucleus power plant concrete volute pump, described lubricating oil system is connected with the gear-box (2) being located at volute pump (1) top, including the first lubricating oil branch road in parallel and the second lubricating oil branch road, first, second lubricating oil branch road connects and composes first, second oil circuit with gear-box (2) respectively; The bottom of gear-box (2) is provided with dynamic and static pressure lubricating bearing, and the axle journal of the output shaft of gear-box (2) is located in dynamic and static pressure lubricating bearing; Described lubricating oil system also includes the 3rd lubricating oil branch road being connected with the fuel feed hole of the dynamic and static pressure lubricating bearing of gear-box (2), 3rd lubricating oil branch road is provided with high-voltage electric oil pump (6), high-voltage electric oil pump (6) and gear-box (2) and connects and composes the 3rd oil circuit. The present invention by setting up the 3rd oil circuit in lubricating oil system, it may be achieved the lossless startup of bearing, safe and reliable, and can extend the service life of system, and cost is low.
Description
Technical field
The invention belongs to nuclear power plant's concrete volute pump corollary system design field, be specifically related to the lubricating oil system of a kind of nucleus power plant concrete volute pump.
Background technology
The rotating speed of nuclear power plant's circulation employing concrete volute pump is much lower relative to centrifugal pump, and general rotating speed is at below 200r/min. As shown in Figure 2, generally, the motor 3 driving volute pump 1 operating passes through to be located at the rotor of gear-box 2 (vertical-type planetary gear reduction box) and volute pump 1 above volute pump 1 and is indirectly connected with, gear-box 2 adopts crown gear coupling to be connected with motor 3, rigid attachment between the rotor of gear-box 2 and volute pump 1. Adopting this connected mode, the speed change of gear-box 2 can being passed through to reduce the output speed of motor 3, thus obtaining the rotating speed required for volute pump 1.
Generally, volute pump group is configured with lubricating oil system, and its function is to provide for the lubricant housings of gear-box 2 to meet the lubricating oil that flow, pressure, temperature, cleannes etc. require. Generally, lubricating oil system includes: oil sump and in parallel with gear-box 2 two lubricating oil branch roads, is provided with oil pump, filter, cooler, pipeline, valve, instrument etc. in each branch road. The oil pump of one of them lubricating oil branch road is the low-pressure electric oil pump 4 of an auxiliary, is arranged on gear-box 2 body side medium position; Oil pump in another lubricating oil branch road is a mechanical oil pump 5, is arranged on gear-box 2 case lid top. Mechanical oil pump 5 and low-pressure electric oil pump 4 are all vertical gear pump, and flow is 0.5m3About/h, lift is about 60m.
Additionally, the bottom of gear-box 2 is provided with dynamic and static pressure lubricating bearing, the axle journal of the output shaft of gear-box 2 is located in dynamic and static pressure lubricating bearing. Dynamic and static pressure lubricating bearing bottom gear-box 2, except bearing the radial force of gear-box and volute pump, is conducted oneself with dignity also subject to gear-box 2, the deadweight of the rotor of volute pump 1 and produced downward axial thrust during the work of volute pump group.For nuclear power plant's mammoth pump group, owing to concrete spiral casing pump startup load is very big, after calculating, the thrust pad area of this bearing and tile fragment quantity are all relatively larger, no matter it is install or overhaul to be required for very big space, the concrete spiral casing pump gearbox that current in-service nuclear power plant uses does not satisfy the requirements; Additionally, before volute pump motor 3 startup operating, due to pump group hydraulic thrust and rotor gravity effect, make the gap between the dynamic and static tile fragment of dynamic and static pressure lubricating bearing only small, oil film cannot be formed, if directly initiating motor 3, it is possible to can make to damage because of oil-free between the dynamic and static tile fragment of bearing.
Summary of the invention
For the defect existed in prior art, it is an object of the invention to provide the lubricating oil system of a kind of new safe and reliable and that cost is low nuclear power plant's concrete volute pump.
For reaching object above, the technical solution used in the present invention is: the lubricating oil system of a kind of nucleus power plant concrete volute pump, described lubricating oil system is connected with the gear-box being located at above volute pump, including the first lubricating oil branch road in parallel and the second lubricating oil branch road, first lubricating oil branch road includes low-pressure electric oil pump, low-pressure electric oil pump and gear-box connect and compose the first oil circuit, second lubricating oil branch road includes mechanical oil pump, mechanical oil pump and gear-box and connects and composes the second oil circuit; The bottom of gear-box is provided with dynamic and static pressure lubricating bearing, and the axle journal of the output shaft of gear-box is located in dynamic and static pressure lubricating bearing; Described lubricating oil system also includes the 3rd lubricating oil branch road that the fuel feed hole of the dynamic and static pressure lubricating bearing with gear-box is connected, and is provided with high-voltage electric oil pump in the 3rd lubricating oil branch road, and high-voltage electric oil pump and gear-box connect and compose the 3rd oil circuit.
Further, in first, second oil circuit, the lubricating oil that is connected with gear-box injects the side that pipeline is connected on gear-box its end, power shaft place, the side that the lubricating oil discharge pipe being connected with gear-box is connected on gear-box its end, output shaft place.
Further, the port of export of low-pressure electric oil pump, mechanical oil pump and high-voltage electric oil pump is respectively equipped with check-valves.
Further, first, second, and third oil circuit is respectively equipped with pressure detector.
The present invention by arranging the 3rd oil circuit in lubricating oil system, can make dynamic and static pressure lubricating bearing accomplish lossless startup, safe and reliable, and because the hydraulic oil loop works time is shorter, it is possible to is greatly prolonged system service life. Additionally, relative to the mode adopting the installing space increasing concrete volute pump group, the application by arranging the high-pressure oil pump being connected with bearing in lubricating oil system, it is possible to reduces cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lubricating oil system of a kind of nucleus power plant provided by the invention concrete volute pump;
Fig. 2 is the structural representation of the lubricating oil system of existing nuclear power plant concrete volute pump.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, the lubricating oil system of a kind of nucleus power plant provided by the present invention concrete volute pump, described lubricating oil system is connected with the gear-box 2 being located at above volute pump 1, including the first lubricating oil branch road in parallel and the second lubricating oil branch road, first lubricating oil branch road includes low-pressure electric oil pump 4, low-pressure electric oil pump 4 and gear-box 2 connect and compose the first oil circuit, and the second lubricating oil branch road includes mechanical oil pump 5, mechanical oil pump 5 and gear-box 2 and connects and composes the second oil circuit;The bottom of gear-box 2 is provided with dynamic and static pressure lubricating bearing, and the axle journal of the output shaft of gear-box 2 is located in dynamic and static pressure lubricating bearing; Described lubricating oil system also includes the 3rd lubricating oil branch road that the fuel feed hole of the dynamic and static pressure lubricating bearing with gear-box 2 is connected, and is provided with high-voltage electric oil pump 6, high-voltage electric oil pump 6 and gear-box 2 and connects and composes the 3rd oil circuit in the 3rd lubricating oil branch road.
The present invention is additionally arranged the 3rd oil circuit (i.e. hydraulic oil loop) in the lubricating oil system of concrete volute pump, collectively forms high and low pressure lubricating oil system with original first and second oil circuit (i.e. low pressure oil loop). In dynamic and static pressure lubricating bearing, inject lubricating oil when 3rd oil circuit is for the startup of pump group, shutdown so that the rotor of jack-up volute pump 1, make to form microseparation between the thrust pad of rotor and dynamic and static pressure lubricating bearing, constitute working oil membrane advantageously. Rotor, by jack-up highly about 0.06��0.08mm, is effectively reduced the output shaft of gear-box 2 abrasion to bearing when startup, shutdown, reduces rotor startup moment of friction, the reliability that when improving the startup of pump group, shutdown, thrust bearing works. First and second oil circuit is for the lubrication of other operating mode lower tooth roller box 2.
Generally holding the part that oil sump is gear box structure of lubricating oil, the application, in order to simplify accompanying drawing, Fig. 1, does not represent oil sump emphatically in 2. When lubricating oil system puts into operation, the lubricating oil in oil sump is sent in gear-box 2 by each oil pump, and the lubricating oil discharged from gear-box 2 is back in oil sump, recycles, to maintain system pressure.
In first, second lubricating oil system of the present invention, the lubricating oil that is connected with gear-box 2 injects the side that pipeline can be connected on gear-box 2 its end, power shaft place, the side that the lubricating oil discharge pipe being connected with gear-box 2 can be connected on gear-box 2 its end, output shaft place.
Additionally, the port of export of low-pressure electric oil pump 4, mechanical oil pump 5 and high-voltage electric oil pump 6 is respectively equipped with check-valves 10.
Generally, after the first lubricating oil branch road in parallel and the convergence point of the second lubricating oil branch road are positioned at check-valves 10, and the pipeline after convergence point can set gradually double-drum filter 7 and oil cooler 8.
In the 3rd oil circuit that the present invention sets up, the outlet line of high-voltage electric oil pump 6 can be provided with the monotubular filter 9 between check-valves 10 and gear-box 2.
First, second, and third lubricating oil branch road can also connect bypass with relief valve 11 respectively, when system pressure is too high for pressure release. Such as, in the first lubricating oil branch road, the access point of bypass with relief valve 11 may be located at the port of export of low-pressure electric oil pump 4, and this bypass can be connected to the entrance point of low-pressure electric oil pump 4 by pipeline; After in second, third lubricating oil branch road, the access point of bypass with relief valve 11 can be located at the check-valves 10 of each branch road, the two by-passes around pipeline and is connected on gear-box 2.
It addition, first and second and three is respectively equipped with pressure detector in oil circuit, to monitor system oil pressure.
The method of operation of volute pump and oil pump is illustrated below according to the lubricating oil system of nucleus power plant provided by the invention concrete volute pump:
Before concrete volute pump group starts, first start low-pressure electric oil pump 4, when lubricating oil system pressure reaches setting valve, start high-voltage electric oil pump 6; When hydraulic oil circuit pressure reach threshold value 1. time, start the motor 3 of volute pump 1, the rotor of volute pump 1 is by after jack-up, 2. the pressure in hydraulic oil loop be down to threshold value, now send signal instruction concrete volute pump group to have been started up, enter accidental conditions, now, low-pressure electric oil pump 4 is stopped transport, and mechanical oil pump 5 operates normal to maintain system oil pressure.Because when pump group runs well, the oil film between the dynamic and static tile fragment of dynamic and static pressure lubricating bearing is stable to be formed, and hydraulic oil loop need not continue to run with, therefore high-voltage electric oil pump 6 is also stopped transport.
When concrete volute pump group is shut down, starting high-voltage electric oil pump 6, after the rotor of volute pump 1 is out of service, high-voltage electric oil pump 6 is out of service. The mechanical oil pump 5 now always run is stopped transport, and low-pressure electric oil pump 4 puts into operation. After pump group is stopped transport 10 minutes, low-pressure electric oil pump 4 finally cuts out.
The present invention is when application, lubricating oil system is the need of arranging tiling operating pressure when hydraulic oil loop depends on that gear-box end thrust bearing starts, if the operating pressure that when starting, thrust bearing shoe work surface bears is more than setting, then must adopting hydraulic oil loop, otherwise thrust bearing shoe work surface can wear and tear.
Structure of the present invention is not limited to the embodiment described in detailed description of the invention, and those skilled in the art draw other embodiment according to technical scheme, also belongs to the technological innovation scope of the present invention.
Claims (4)
1. the lubricating oil system of nuclear power plant's concrete volute pump, described lubricating oil system is connected with the gear-box (2) being located at volute pump (1) top, including the first lubricating oil branch road in parallel and the second lubricating oil branch road, first lubricating oil branch road includes low-pressure electric oil pump (4), low-pressure electric oil pump (4) and gear-box (2) connect and compose the first oil circuit, second lubricating oil branch road includes mechanical oil pump (5), mechanical oil pump (5) and gear-box (2) and connects and composes the second oil circuit; The bottom of gear-box (2) is provided with dynamic and static pressure lubricating bearing, and the axle journal of the output shaft of gear-box (2) is located in dynamic and static pressure lubricating bearing; It is characterized in that, described lubricating oil system also includes the 3rd lubricating oil branch road being connected with the fuel feed hole of the dynamic and static pressure lubricating bearing of gear-box (2), 3rd lubricating oil branch road is provided with high-voltage electric oil pump (6), high-voltage electric oil pump (6) and gear-box (2) and connects and composes the 3rd oil circuit.
2. the lubricating oil system of a kind of nuclear power plant according to claim 1 concrete volute pump, it is characterized in that, in first, second oil circuit, the lubricating oil being connected with gear-box (2) injects pipeline and is connected to the side of gear-box (2) its end, power shaft place upper, and the lubricating oil discharge pipe being connected with gear-box (2) is connected to the side of gear-box (2) its end, output shaft place upper.
3. the lubricating oil system of a kind of nuclear power plant according to claim 1 and 2 concrete volute pump, it is characterized in that, the port of export of low-pressure electric oil pump (4), mechanical oil pump (5) and high-voltage electric oil pump (6) is respectively equipped with check-valves (10).
4. the lubricating oil system of a kind of nuclear power plant according to claim 1 concrete volute pump, it is characterised in that be respectively equipped with pressure detector in first, second, and third oil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410058540.5A CN103851323B (en) | 2014-02-20 | 2014-02-20 | A kind of lubricating oil system of nuclear power plant concrete volute pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410058540.5A CN103851323B (en) | 2014-02-20 | 2014-02-20 | A kind of lubricating oil system of nuclear power plant concrete volute pump |
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| CN103851323A CN103851323A (en) | 2014-06-11 |
| CN103851323B true CN103851323B (en) | 2016-06-08 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE509078C2 (en) * | 1993-10-13 | 1998-11-30 | Kvaerner Hymac Inc | Uninterrupted lubrication system for a machine |
| DE19619843C2 (en) * | 1996-05-17 | 1999-03-04 | Man B & W Diesel Gmbh | Oil supply facility |
| CN101793307B (en) * | 2009-12-31 | 2011-11-09 | 江苏泰隆减速机股份有限公司 | Straight-tooth gear planetary transmission device of nuclear power water circulation cooling pump |
| CN202091487U (en) * | 2010-12-15 | 2011-12-28 | 西门子公司 | Gearbox oil filtering system used for gearbox of wind turbine |
| CN203363615U (en) * | 2013-06-18 | 2013-12-25 | 中国核电工程有限公司 | Redundant structure of concrete volute casing pump lubricating oil system in nuclear power plant |
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