CN103277342B - The centrifugal Residual heat removal pump reflux device of a kind of nuclear power - Google Patents
The centrifugal Residual heat removal pump reflux device of a kind of nuclear power Download PDFInfo
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- CN103277342B CN103277342B CN201310251695.6A CN201310251695A CN103277342B CN 103277342 B CN103277342 B CN 103277342B CN 201310251695 A CN201310251695 A CN 201310251695A CN 103277342 B CN103277342 B CN 103277342B
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- impeller
- return port
- pump housing
- pump
- protecgulum
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- 238000010992 reflux Methods 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 11
- 230000010349 pulsation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses the centrifugal Residual heat removal pump reflux device of a kind of nuclear power, form with return line (9) mode refluxed by the return port one (2) offered on protecgulum (1) and the return port offered on the pump housing (3) two (8), contrary and the impeller inlet place current race conditio that causes of flow path direction is carried out in the backflow direction and impeller solved because adopting conventional impellers equalizing orifice liquid, thus improve the efficiency of pump, reduce the critical NPSH of pump, and effectively improve the pressure pulsation situation at impeller outlet place, simultaneously can by changing the position of the return port offered, size and number, reach and carry high performance optimum efficiency.
Description
Technical field
The present invention relates to the centrifugal residual heat removal pump of a kind of nuclear power, be specifically related to a kind of reflux.
Background technique
Million kilowatt nuclear power residual heat removal pump belongs to core two stage pump, is the important component part of the residual heat removal system RRA of one loop of nuclear power station.Its function gets rid of reactor waste, is one of nuclear-plant of most critical.Because waste heat accounts for 2 ~ 3% of power station total thermal power, the hydraulic part of residual heat removal pump designs and develops the biggest problem becoming its production domesticization of restriction of generally acknowledging in the industry.The structural type of traditional residual heat removal pump is horizontal, single-stage, single suction, back opening door centrifugal pump, and center line supports.Pump adopts level suction, vertically upward discharging structure, and rotor is cantilever structure.Impeller outer arranges radial stator, makes uniform liquid enter annular delivery chamber, to eliminate balance radial force.Choma before and after impeller is set, and on impeller, offers equalizing orifice to adjust the size of axial force, make pump shaft usually be in less Tensile state.Because nuclear power pump requires higher, associated documents specify the equal stable operation and be not subject to the impact of changes in flow rate within the scope of minimum discharge to peak rate of flow of this kind of pump, and all cavitation do not occur under any operating mode specified.Traditional axial thrust balancing devices of usual employing pump, when namely offering equalizing orifice on impeller, carry out flow path direction by backflow direction and the impeller of impeller balance hole liquid contrary, destroy normal flowing state, cause impeller inlet place current disorderly, reduce the efficiency of pump.Backflow whirlpool can induce generation vibration & noise, and causes whirlpool cavitation, breaks and changes flow passage components, reduces the life-span of pump.Address these problems, should control the circumfluence of centrifugal pump.Therefore, the reflux studying novel applicable nuclear power residual heat removal pump realizes this kind of pump to domesticize one of the problem that must solve.
Summary of the invention
The object of the present invention is to provide the centrifugal Residual heat removal pump reflux device of a kind of nuclear power, improve security and stability and the operational efficiency of residual heat removal pump.
The present invention by offering return port on protecgulum and the pump housing, solves because adopting the backflow direction of conventional impellers equalizing orifice liquid and impeller to carry out the contrary and impeller inlet place current disorder problem that causes of flow path direction.The concrete technological scheme that the present invention adopts is as follows:
The centrifugal Residual heat removal pump reflux device of a kind of nuclear power, comprises choma 7, return line 9, bearing bracket stand 10, axle 11, impeller preoral loop 12 after protecgulum 1, the pump housing 3, stator 4, impeller 5, impeller nut 6, impeller; Wherein protecgulum 1, the pump housing 3, stator 4, impeller preoral loop 12, bearing bracket stand 10 are arranged vertically successively, and protecgulum 1 is fixedly connected with the pump housing 3, and the pump housing 3 is fixedly connected with stator 4, and protecgulum 1 is connected with stator 4 port, and the pump housing 3 is fixedly connected with bearing bracket stand 10; Impeller nut 6 and impeller 5 are fixed on axle 11 successively, and circumferentially can rotate relative to protecgulum 1, the pump housing 3, stator 4, bearing bracket stand 10; The position of impeller 5 center line of discharge is corresponding with stator 4 runner middle section, and impeller preoral loop 12 is fixedly connected with protecgulum 1, and impeller preoral loop 12 and impeller 5 adopt Spielpassung, and impeller 5 and the pump housing 3 are by choma 7 Spielpassung after impeller; It is characterized in that, after the impeller of the pump housing 3, between choma 7 and axle 11, on position, circumference evenly offers 5-8 return port 28; Return port 1 is circumferentially evenly offered in the inlet tube cross section of protecgulum 1, and size, quantity are identical with return port 28, return port 1, return port 28 are fixedly connected with return line 9 two ends respectively, and form reflux by return line 9; Fluid flows out from impeller outlet, and after impeller, choma 7 and the gap of the pump housing 3, flow through return port 28, return line 9 and return port 1 and get back to impeller inlet.
The distance on the described tube section offering return port 1 distance impeller inlet limit is in the axial direction 0.8-1.2 times of impeller inlet diameter length.
The diameter of a circle that the center line of described return port 28 surrounds be the 0.55-0.65 of impeller preoral loop 12 place diameter doubly.
Described return port 28 is radial corresponding with return port 1, as shown in Figure 3.
Described return port 1, the gross area of return port 28 are 6-9 times of choma 7 and the pump housing 3 interval area after impeller.
Working procedure of the present invention is: the nuclear power impeller of centrifugal residual heat removal pump rotates acting under driven by motor, be pressure energy and the speed energy of liquid by the changes mechanical energy of motor, major part highly pressurised liquid flows out impeller and enters stator, spiral case and export pipeline, sub-fraction liquid enters in the front and back cavity that impeller and the pump housing formed, especially choma after impeller, enter back cavity return port, before the impeller under differential pressure action, be pressed into return line and turn back to return port on inlet tube, form backflow, this backflow does not directly enter impeller, the distribution of impeller flow field can not be upset, and this return pressure is relatively high, the cavitation performance of impeller inlet can be improved.
The invention has the advantages that: by offering the reflux type of return port on protecgulum and the pump housing, this flow path direction that refluxes out is consistent with Flow in Impeller direction, and the contrary and impeller inlet place current race conditio that causes of flow path direction is carried out in the backflow direction and impeller can effectively improved because adopting conventional impellers equalizing orifice liquid.Thus improve the efficiency of pump, reduce the critical NPSH of pump, and effectively improve the pressure pulsation situation at impeller outlet place.By changing position, the size and number of the return port offered, can reach and carrying high performance optimum efficiency simultaneously.
Accompanying drawing explanation
Fig. 1: the present invention adopts the reflux schematic diagram offered return port and formed
Fig. 2: the return port place pump housing and pipeline connection diagram
Fig. 3: the axis plane projection schematic diagram of return port on impeller central axial plane
Fig. 4: the residual heat removal pump reflux type schematic diagram adopting the present invention's design
In figure: 1. protecgulum, 2. return port one, the 3. pump housing, 4. stator, 5. impeller, 6. impeller nut, 7. choma after impeller, 8. return port two, 9. return line, 10. bearing bracket stand, 11. axles, 12. impeller preoral loops.
Embodiment
Embodiment 1
The residual heat removal pump reflux of the present invention's design, as shown in Figure 1, on protecgulum 1, the pump housing 3, circumference evenly offers 5 return ports, one 2,5 return ports 28 respectively, is fixedly connected with respectively, as shown in Figure 2 with return line 9 two ends.Return port area is 6 times of choma 7 and the pump housing 3 interval area after impeller, 5 return port 1 place tube sections are axially apart from the distance of the 0.8 times of impeller inlet diameter in impeller inlet limit, and the diameter of 5 return port 28 center lines is the inner diameter of 0.55 times of impeller preoral loop 12.Return port 1, return port 28 are all arranged from vertical center line, and with same equal angles
θrotate in a circumferential direction distribution,
θ=72 °.Liquid stream enters rear pump chamber from impeller 5 outlet, flows through the return port 1 that return line 9 arrives protecgulum 1, then is mixed into impeller with import current, as shown in Figure 4 by the return port 28 on the pump housing.
Embodiment 2
On protecgulum 1, the pump housing 3, circumference evenly offers 8 return port return ports 1, return port 28 respectively, is fixedly connected with respectively, as shown in Figure 2 with return line 9 two ends.Return port area is 9 times of choma 7 and the pump housing 3 interval area after impeller, 8 return port 1 place tube sections are axially apart from the distance of the 1.2 times of impeller inlet diameters in impeller inlet limit, and the diameter of 8 return port 28 center lines is the inner diameter of 0.65 times of impeller preoral loop 12.Return port 1, return port 28 are all arranged from vertical center line, and with same equal angles
θrotate in a circumferential direction distribution,
θ=45 °.Liquid stream enters rear pump chamber from impeller 5 outlet, flows through the return port 1 that return line 9 arrives protecgulum 1, then is mixed into impeller with import current, as shown in Figure 4 by the return port 28 on the pump housing.
Embodiment 3
On protecgulum 1, the pump housing 3, circumference evenly offers 6 return ports 1, return port 28 respectively, is fixedly connected with respectively, as shown in Figure 2 with return line 9 two ends.Return port area is 7 times of choma 7 and the pump housing 3 interval area after impeller, and 6 return port 1 place tube sections are axially apart from the distances of the 1.0 times of impeller inlet diameters in impeller inlet limit, and the diameter of 6 return port 28 center lines is the inner diameter of 0.6 times of impeller preoral loop 12.Return port 1, return port 28 are all arranged from vertical center line, and with same equal angles
θrotate in a circumferential direction distribution,
θ=60 °, as shown in Figure 3.Liquid stream enters rear pump chamber from impeller 5 outlet, flows through the return port 1 that return line 9 arrives protecgulum 1, then is mixed into impeller with import current, as shown in Figure 4 by the return port 28 on the pump housing.
Claims (5)
1. the centrifugal Residual heat removal pump reflux device of nuclear power, comprises choma (7), return line (9), bearing bracket stand (10), axle (11), impeller preoral loop (12) after protecgulum (1), the pump housing (3), stator (4), impeller (5), impeller nut (6), impeller; Wherein protecgulum (1), the pump housing (3), stator (4), impeller preoral loop (12), bearing bracket stand (10) are arranged vertically successively, protecgulum (1) is fixedly connected with the pump housing (3), the pump housing (3) is fixedly connected with stator (4), protecgulum (1) is connected with stator (4) port, and the pump housing (3) is fixedly connected with bearing bracket stand (10); Impeller nut (6) and impeller (5) are fixed on axle (11) successively, and circumferentially can rotate relative to protecgulum (1), the pump housing (3), stator (4), bearing bracket stand (10); The position of impeller (5) center line of discharge is corresponding with stator (4) runner middle section, impeller preoral loop (12) is fixedly connected with protecgulum (1), impeller preoral loop (12) and impeller (5) adopt Spielpassung, and impeller (5) and the pump housing (3) are by choma after impeller (7) Spielpassung; It is characterized in that, after the impeller of the pump housing (3), between choma (7) and axle (11), on position, circumference evenly offers 5-8 return port two (8); Return port one (2) is circumferentially evenly offered in the inlet tube cross section of protecgulum (1), and size, quantity are identical with return port two (8), return port one (2), return port two (8) are fixedly connected with return line (9) two ends respectively, and form reflux by return line (9); Fluid flows out from impeller outlet, and after impeller, choma (7) and the gap of the pump housing (3), flow through return port two (8), return line (9) and return port one (2) and get back to impeller inlet.
2. the centrifugal Residual heat removal pump reflux device of nuclear power according to claim 1, is characterized in that, described in offer return port one (2) the distance on tube section distance impeller inlet limit be in the axial direction 0.8-1.2 times of impeller inlet diameter length.
3. the centrifugal Residual heat removal pump reflux device of nuclear power according to claim 1, is characterized in that, the diameter of a circle that the center line of described return port two (8) surrounds be the 0.55-0.65 of impeller preoral loop (12) place diameter doubly.
4. the centrifugal Residual heat removal pump reflux device of nuclear power according to claim 1, is characterized in that, described return port two (8) is radial corresponding with return port one (2).
5. the centrifugal Residual heat removal pump reflux device of nuclear power according to claim 1, it is characterized in that, described return port one (2), the gross area of return port two (8) are 6-9 times of choma (7) and the pump housing (3) interval area after impeller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310251695.6A CN103277342B (en) | 2013-06-24 | 2013-06-24 | The centrifugal Residual heat removal pump reflux device of a kind of nuclear power |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310251695.6A CN103277342B (en) | 2013-06-24 | 2013-06-24 | The centrifugal Residual heat removal pump reflux device of a kind of nuclear power |
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| Publication Number | Publication Date |
|---|---|
| CN103277342A CN103277342A (en) | 2013-09-04 |
| CN103277342B true CN103277342B (en) | 2015-07-29 |
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| CN201310251695.6A Expired - Fee Related CN103277342B (en) | 2013-06-24 | 2013-06-24 | The centrifugal Residual heat removal pump reflux device of a kind of nuclear power |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088798B (en) * | 2014-06-30 | 2016-08-24 | 广东顺达船舶工程有限公司 | Noise reduction damping centrifugal pump |
| CN105508302A (en) * | 2016-01-15 | 2016-04-20 | 江苏大学 | Refluxing device for decreasing axial force of centrifugal pump |
| CN112360814B (en) * | 2020-10-09 | 2022-04-26 | 江苏大学 | Stomach type suction tube non-uniform inflow active control device and pump |
| CN114215790B (en) * | 2021-12-29 | 2024-04-16 | 浙江韩益机电有限公司 | Centrifugal pump capable of actively inhibiting cavitation, design method and installation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201401342Y (en) * | 2009-05-13 | 2010-02-10 | 丹东克隆集团有限责任公司 | High-high pressure area reflux cooling magnetic pump |
| CN201443516U (en) * | 2009-05-27 | 2010-04-28 | 辽宁恒星泵业有限公司 | Magnetic pump |
| CN102022341A (en) * | 2010-06-09 | 2011-04-20 | 马明文 | Mortar magnetic pump |
| CN203404136U (en) * | 2013-06-24 | 2014-01-22 | 江苏大学 | Flow backing device of nuclear power centrifugation-type excess heat discharge pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6932563B2 (en) * | 2003-05-05 | 2005-08-23 | Honeywell International, Inc. | Apparatus, system and method for minimizing resonant forces in a compressor |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201401342Y (en) * | 2009-05-13 | 2010-02-10 | 丹东克隆集团有限责任公司 | High-high pressure area reflux cooling magnetic pump |
| CN201443516U (en) * | 2009-05-27 | 2010-04-28 | 辽宁恒星泵业有限公司 | Magnetic pump |
| CN102022341A (en) * | 2010-06-09 | 2011-04-20 | 马明文 | Mortar magnetic pump |
| CN203404136U (en) * | 2013-06-24 | 2014-01-22 | 江苏大学 | Flow backing device of nuclear power centrifugation-type excess heat discharge pump |
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| CN103277342A (en) | 2013-09-04 |
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Granted publication date: 20150729 |