CN203822687U - Axial force balancing device for CPR 1000 MW centrifugal charging pump - Google Patents
Axial force balancing device for CPR 1000 MW centrifugal charging pump Download PDFInfo
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- CN203822687U CN203822687U CN201420174233.9U CN201420174233U CN203822687U CN 203822687 U CN203822687 U CN 203822687U CN 201420174233 U CN201420174233 U CN 201420174233U CN 203822687 U CN203822687 U CN 203822687U
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- axial force
- impeller
- rotating ring
- charging pump
- wear
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Abstract
The utility model discloses an axial force balancing device for a CPR 1000 MW centrifugal charging pump and aims to solve the problem of excessive axial force caused by interstage leakage of symmetrically arranged impellers of a CPR 1000 MW centrifugal charging pump. The axial force balancing device is mounted on a guide vane at the middle section and comprises a stationary ring, a spring, an O-shaped ring, a wear-resistant bush, a wear-resistant pair, a rotating ring, a spiral seal, a balancing hole and a back blade, wherein the back blade and the balancing hole can reduce the axial force; the spiral seal can reduce leakage of a liquid from a high-pressure zone to a low-pressure zone; the rotating ring and the wear-resistant pair are in close contact to separate the high-pressure liquid from the low-pressure liquid. The axial force balancing device can achieve zero interstage leakage in practice, solve the problems of excessive axial force and shaft heating, realize balanced axial force and improve the efficiency and the operation reliability of the pump.
Description
Technical field
The present invention relates to a kind of axial force balance device of multistage centrifugal pump, particularly a kind of axial thrust balancing devices of CPR1000MW centrifugal charging pump.
Background technique
CPR1000MW centrifugal charging pump is a kind of horizontal, Double-casing, tubular multistage centrifugal pump, is the important component part of the cvcs (RCV) in a loop.On fill pump and have that flow is little, lift is high, rotating speed high, very high to its performance requirement, technical difficulty is large.On fill pump major function: (1) is normally moved at nuclear power station, under startup and shutdown condition, to reactor coolant loop, provide the upper water-filling with BAS, and stable loop system pressure is also controlled the fluctuation of voltage stabilizer water level; (2) to 3 main pumps, provide the mechanical seal cooling water of certain flow, the mechanical seal of assurance main pump is normally worked, and stops in main pump and has a Loop Water of radiation to leak; (3) under accident conditions, to reactor coolant loop, provide boron water, to maintain pressure; (4) when accident conditions, above fill pump and also as high-voltage safety water injection pump, use, the high concentration of boric acid water in reactor refuling water tank is injected to a loop, to control reactivity, when there is material-changing water tank low water level, peace note proceeds to the recirculation stage automatically.
Because CPR1000MW centrifugal charging pump function in nuclear island one loop is complicated, the service behaviour point of requirement is many, and range of flow span is very large, adds that the total head of pump is very high, gives above to fill in pump design and has brought very large difficulty.In order to reduce axial force as far as possible, CPR1000MW centrifugal charging pump conventionally adopts and is arranged symmetrically with blade wheel structure, but this structure is kept away unavoidable CPR1000MW centrifugal charging pump and between the 6th grade and the tenth secondary, is produced inter-stage and leak, if leakage rate is zero, this axial force is zero, what leak is more, and the additional axial force of pointing to suction side is larger.Excessive axial force can cause bearing heating, generally need to install Balance disc or balancing drum device additional, can make so again structure become complicated, reduce the efficiency of pump, therefore need to invent a kind of new impeller CPR1000MW centrifugal charging pump axial thrust balancing devices that is arranged symmetrically with, the axial force of filling pump on can balance.
Summary of the invention
For addressing the above problem, the invention provides a kind of axial thrust balancing devices of CPR1000MW centrifugal charging pump, it can be realized between zero level and leaking, balancing axial thrust, the problem of having avoided the excessive axle causing of axial force to generate heat, the reliable operation of assurance pump.
For achieving the above object, the technological scheme that the present invention takes is: the rotor part of CPR1000MW centrifugal charging pump consists of ten sencond stage impellers, the first six grade of impeller of described ten sencond stage impellers and seven to ten sencond stage impeller is back-to-back is arranged symmetrically with, the water intake of the first six grade of impeller fills the motor drive terminal of pump on pointing to, this impeller of arranging is back-to-back owing to existing inter-stage to leak, axial force does not have complete equilibrium, therefore also need on the intermediate section stator between the tenth sencond stage impeller (being yet impeller) and the 6th grade of impeller, axial thrust balancing devices be housed.This device is in close the 6th grade of impeller one end, the stationary ring parts of device are connected with intermediate section stator by hexagon socket head cap screw, O type circle is housed respectively on the surface of contact of stationary ring and stator, stationary ring and anti-wearing liner, is used for guaranteeing that liquid can not leak by gap between the two; Between stationary ring and anti-wearing liner, with some springs, the elastic force of spring can guarantee wear-resisting friction pair and rotating ring interior edge face close contact, by friction pair and rotating ring close contact, highly pressurised liquid and low pressure liquid is separated, and realizes inter-stage zero leakage; Between anti-wearing liner and the 6th grade of impeller hub, there is the gap of 0.5mm～1.5mm, at the 6th grade of impeller, evenly have the equalizing orifice that 3～8 diameters are 3.0mm～8.5mm near the back shroud of suction side, when diameter is got large value, the quantity of corresponding equalizing orifice is few, when diameter gets the small value, the quantity of corresponding equalizing orifice is many; The water that equalizing orifice flows out arrives the cavity between wear-resisting friction pair and rotating ring by gap between anti-wearing liner and the 6th grade of impeller hub, play the effect of lubrication friction pair, the surface of wear-resisting friction pair is cellular, be conducive to like this lubrication of water to friction pair, can prevent that friction pair and rotating ring end-face friction are overheated, extend the working life of friction pair; Rotating ring is connected with axle by key, on rotating ring ear end face, there are equally distributed 4～8 back blades, between rotating ring and impeller wheel hub, spiral seal is housed, when rotating ring, spiral seal and axle together rotate, spiral seal can reduce the leakage rate from zone of high pressure to low pressure area, and back blade can reduce to act on the pressure on rotating ring ear end face; On impeller back shroud, be evenly distributed with 6～12 back blades, be used for balancing axial thrust.
By above technological scheme, just can solve the problem of leaking the excessive and axle heating of caused axial force between pump stage of filling, the beneficial effects of the utility model are, realizing inter-stage spillage is zero, reaches balancing axial thrust, improves the efficiency of pump and the object of operational reliability.
Accompanying drawing explanation
Fig. 1 is an embodiment's of the utility model ssembly drawing;
Fig. 2 is an embodiment's of the utility model structural representation;
In Fig. 1-2: 1. first stage impeller, 2. the 6th grade of impeller, 3. impeller (or claiming the tenth sencond stage impeller), 4. intermediate section stator, 5,7. back blade, 6. spiral seal, 8. rotating ring, 9. anti-wearing liner, 10. spring, 11,14.O type circle, 12. equalizing orifices, 13. stationary rings, 15. hexagon socket head cap screws, 16. wear-resisting friction pairs.
Embodiment
Fig. 1 is an embodiment's of the utility model ssembly drawing (not drawing whole stators), the rotor part of CPR1000MW centrifugal charging pump consists of ten sencond stage impellers, the first six grade of impeller of described ten sencond stage impellers and seven to ten sencond stage impeller is back-to-back is arranged symmetrically with, the water intake of the first six grade of impeller fills the motor drive terminal of pump on pointing to, this impeller of arranging is back-to-back owing to existing inter-stage to leak, axial force does not have complete equilibrium, therefore also need on the intermediate section stator (4) between the tenth sencond stage impeller (being also impeller) (3) and the 6th grade of impeller (2), axial thrust balancing devices be housed.
Fig. 2 is an embodiment's of the utility model structural representation, as can be seen from the figure, this device is in close the 6th grade of impeller (2) one end, stationary ring (13) parts of device are connected with intermediate section stator (4) by hexagon socket head cap screw (15), on the surface of contact of stationary ring (13) and stator (4), stationary ring (13) and anti-wearing liner (9), O type circle (11) (14) is housed respectively, is used for guaranteeing that liquid can not leak by gap between the two; Between stationary ring (13) and anti-wearing liner (9) with some springs (10), the elastic force of spring can guarantee wear-resisting friction pair (16) and rotating ring (8) interior edge face close contact, by friction pair (16) and rotating ring (8) close contact, highly pressurised liquid and low pressure liquid are separated, realized inter-stage zero leakage; Between anti-wearing liner (9) and the 6th grade of impeller (2) wheel hub, there is the gap of 0.5mm～1.5mm, at the 6th grade of impeller (2), near on the back shroud of suction side, evenly have the equalizing orifice that 3～8 diameters are 3.0mm～8.5mm (12), when diameter is got large value, the quantity of corresponding equalizing orifice is few, when diameter gets the small value, the quantity of corresponding equalizing orifice is many; The water that equalizing orifice (12) flows out arrives the cavity between wear-resisting friction pair (16) and rotating ring (8) by gap between anti-wearing liner (9) and the 6th grade of impeller (2) wheel hub, play the effect of lubrication friction pair, the surface of wear-resisting friction pair (16) is cellular, be conducive to like this lubrication of water to friction pair, can prevent that friction pair and rotating ring end-face friction are overheated, extend the working life of friction pair; Rotating ring (8) is connected with axle by key, on rotating ring ear end face, there are equally distributed 4～8 back blades (7), between rotating ring (8) and impeller (3) wheel hub, spiral seal (6) is housed, when spiral seal (6), rotating ring (8) together rotate with axle, spiral seal (6) can reduce the leakage rate from zone of high pressure to low pressure area, and back blade (7) can reduce to act on the pressure on rotating ring ear end face; On impeller back shroud, be evenly distributed with 6～12 back blades (5), be used for balancing axial thrust.
It is zero that the utility model can be realized inter-stage spillage in practice, reaches balancing axial thrust, improves the efficiency of pump and the object of operational reliability.
Above, be illustrating that patent of the present invention is made with reference to several embodiments, but the present invention is not limited to above-described embodiment, also comprises other embodiments or variation within the scope of design of the present invention.
Claims (4)
1. the axial thrust balancing devices of a CPR1000MW centrifugal charging pump, be arranged near on the intermediate section stator of the 6th grade of impeller one end, described axial thrust balancing devices comprises stationary ring, spring, O type circle, anti-wearing liner, wear-resisting friction pair, rotating ring, spiral seal, equalizing orifice and back blade, it is characterized in that:
Described stationary ring parts are connected with intermediate section stator by hexagon socket head cap screw, rotating ring is connected with axle by key, between stationary ring and anti-wearing liner, with spring, the elastic force of spring can guarantee wear-resisting friction pair and rotating ring interior edge face close contact, and highly pressurised liquid and low pressure liquid are separated;
Described O type circle is arranged on respectively on the surface of contact of stationary ring and stator, stationary ring and anti-wearing liner, to prevent that the gap that liquid passes through between the two from leaking;
Described spiral seal, between rotating ring and impeller wheel hub, rotates with the axis to reduce the leakage rate from zone of high pressure to low pressure area.
2. the axial thrust balancing devices of a kind of CPR1000MW centrifugal charging pump as claimed in claim 1, it is characterized in that: the gap that has 0.5mm～1.5mm between anti-wearing liner and the 6th grade of impeller hub, at the 6th grade of impeller, evenly have the equalizing orifice that 3～8 diameters are 3.0mm～8.5mm near the back shroud of suction side, when diameter is got large value, the quantity of corresponding equalizing orifice is few, when diameter gets the small value, the quantity of corresponding equalizing orifice is many.
3. the axial thrust balancing devices of a kind of CPR1000MW centrifugal charging pump as claimed in claim 1, is characterized in that: wear-resisting surface of friction pair is cellular, has equally distributed 4～8 back blades on rotating ring ear end face.
4. the axial thrust balancing devices of a kind of CPR1000MW centrifugal charging pump as claimed in claim 1, is characterized in that: on impeller back shroud, be evenly distributed with 6～12 back blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420174233.9U CN203822687U (en) | 2014-04-10 | 2014-04-10 | Axial force balancing device for CPR 1000 MW centrifugal charging pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420174233.9U CN203822687U (en) | 2014-04-10 | 2014-04-10 | Axial force balancing device for CPR 1000 MW centrifugal charging pump |
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| Publication Number | Publication Date |
|---|---|
| CN203822687U true CN203822687U (en) | 2014-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420174233.9U Expired - Fee Related CN203822687U (en) | 2014-04-10 | 2014-04-10 | Axial force balancing device for CPR 1000 MW centrifugal charging pump |
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| CN (1) | CN203822687U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178523A (en) * | 2017-07-07 | 2017-09-19 | 中国科学院工程热物理研究所 | Back blade self-checking device and apply its turbomachinery |
| CN109973401A (en) * | 2018-10-24 | 2019-07-05 | 浙江朗庆智能科技有限公司 | Based on centrifugal urea pump |
-
2014
- 2014-04-10 CN CN201420174233.9U patent/CN203822687U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107178523A (en) * | 2017-07-07 | 2017-09-19 | 中国科学院工程热物理研究所 | Back blade self-checking device and apply its turbomachinery |
| CN107178523B (en) * | 2017-07-07 | 2023-07-07 | 衡水中科衡发动力装备有限公司 | Automatic back vane adjusting device and turbine machinery using same |
| CN109973401A (en) * | 2018-10-24 | 2019-07-05 | 浙江朗庆智能科技有限公司 | Based on centrifugal urea pump |
| CN110094339A (en) * | 2018-10-24 | 2019-08-06 | 浙江朗庆智能科技有限公司 | Centrifugal urea pump |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20150410 |
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| EXPY | Termination of patent right or utility model |