CN103277342A - Flow backing device of nuclear power centrifugation type excess heat discharge pump - Google Patents
Flow backing device of nuclear power centrifugation type excess heat discharge pump Download PDFInfo
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- CN103277342A CN103277342A CN2013102516956A CN201310251695A CN103277342A CN 103277342 A CN103277342 A CN 103277342A CN 2013102516956 A CN2013102516956 A CN 2013102516956A CN 201310251695 A CN201310251695 A CN 201310251695A CN 103277342 A CN103277342 A CN 103277342A
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- impeller
- return port
- pump housing
- pump
- protecgulum
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- 238000005119 centrifugation Methods 0.000 title abstract 2
- 238000010992 reflux Methods 0.000 claims 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
- 230000000694 effects Effects 0.000 abstract 1
- 230000008676 import Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging 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 a flow backing device of a nuclear power centrifugation type excess heat discharge pump. By means of a mode of backflow formed by a flow backing hole (2) opened on a front cover (1), a flow backing hole (8) opened on a pump body (3) and a flow backing pipeline (9), the problem of flow turbulence at the position of an impeller inlet caused by the fact that a liquid flow backing direction and an impeller incoming flow direction are opposite due to traditional impeller equalizing orifices is solved, so that the efficiency of the pump is improved, the critical net positive suction head of the pump is reduced, conditions of pressure pulsation at the position of an impeller outlet can be effectively improved, and optimal effects of improving performances are achieved by changing the position, size and number of the opened flow backing holes.
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 belongs to the nuclear two stage pump with residual heat removal pump, is the important component part of the residual heat removal system RRA in nuclear power station one loop.Its function is to get 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 is designed and developed the biggest problem that becomes 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, the center line supporting.Pump employing level sucks, discharging structure vertically upward, and rotor is cantilever structure.Impeller outer arranges radially stator, makes liquid evenly enter annular delivery chamber, to eliminate the balance radial force.Impeller front and back choma is set, and offers the size that equalizing orifice is adjusted axial force at impeller, make pump shaft be in the less extended state that is subjected to usually.Because nuclear power has relatively high expectations with pump, associated documents are stipulated this kind of pump in minimum discharge all stable operation and be not subjected to the influence of changes in flow rate in the peak rate of flow scope, and under any operating mode of stipulating cavitation do not take place all.Usually adopt traditional axial thrust balancing devices of pump, namely when impeller is offered equalizing orifice, backflow direction and impeller by impeller balance hole liquid come flow path direction opposite, have destroyed normal flowing state, cause the current disorder of impeller inlet place, reduce the efficient of pump.The backflow whirlpool can be induced and be produced vibration and noise, and causes the whirlpool cavitation, the broken flow passage components that change, the life-span of reducing pump.Address these problems, should reflux to the import of centrifugal pump and control.Therefore, the novel suitable nuclear power of research is one of problem that realizes the necessary solution of this kind pump production domesticization institute with the reflux of residual heat removal pump.
Summary of the invention
The object of the present invention is to provide a kind of nuclear power with centrifugal residual heat removal pump reflux, improve security and stability and the operational efficiency of residual heat removal pump.
The present invention is by offering return port at protecgulum and the pump housing, and solution comes the disorderly problem of the opposite impeller inlet place current that cause of flow path direction because of the backflow direction that adopts conventional impellers equalizing orifice liquid with impeller.The concrete technological scheme that the present invention adopts is as follows:
A kind of nuclear power is with centrifugal residual heat removal pump reflux, comprises choma (7) behind protecgulum (1), the pump housing (3), stator (4), impeller (5), impeller nut (6), the impeller, return line (9), bearing bracket stand (10), axle (11), impeller preoral loop (12); Wherein protecgulum (1), the pump housing (3), stator (4), impeller preoral loop (12), bearing bracket stand (10) are arranged vertically successively, protecgulum (1) is fixedlyed connected with the pump housing (3), the pump housing (3) is fixedlyed connected with stator (4), protecgulum (1) is connected with stator (4) port, and the pump housing (3) is fixedlyed connected with bearing bracket stand (10); Impeller nut (6) is fixed on the axle (11) successively with impeller (5), and can be with respect to protecgulum (1), the pump housing (3), stator (4), bearing bracket stand (10) along circumferentially rotating; The position of impeller (5) center line of discharge is corresponding with stator (4) runner middle section, impeller preoral loop (12) is fixedlyed connected with protecgulum (1), impeller preoral loop (12) adopts Spielpassung with impeller (5), and impeller (5) and the pump housing (3) are by choma (7) Spielpassung behind the impeller; It is characterized in that, circumferentially evenly offering 5-8 return port (8) on the position between choma (7) behind the impeller of the pump housing (3) and the axle (11); Return port (2) is circumferentially evenly offered in upper edge, inlet tube cross section at protecgulum (1), and size, quantity is identical with return port (8), return port (2), return port (8) are fixedlyed connected with return line (9) two ends respectively, and form reflux by return line (9); Fluid flows out from impeller outlet, and through the gap of choma (7) behind the impeller with the pump housing (3), the return port of flowing through (8), return line (9) and return port (2) are got back to impeller inlet.
Return port (2) is offered in described inlet tube cross section at protecgulum (1), and described tube section is 0.8-1.2 times of impeller inlet diameter length apart from the distance on impeller inlet limit in the axial direction.
The described return port of offering at the pump housing (3) (8), the diameter of a circle that is surrounded by the center line of return port (8) be impeller preoral loop (12) place diameter 0.55-0.65 doubly.
The described return port of offering at the pump housing (3) (8) is radially corresponding with the return port of offering at protecgulum (1) (2), as shown in Figure 3.
The gross area of described return port (2), return port (8) be choma (7) and the pump housing (3) interval area behind the impeller 6-9 doubly.
Working procedure of the present invention is: nuclear power rotates acting with the impeller of centrifugal residual heat removal pump under driven by motor, the mechanical energy of motor is converted into pressure energy and the speed energy of liquid, most of highly pressurised liquid flows out impeller and enters stator, spiral case and export pipeline, sub-fraction liquid enters in the front and back cavity of impeller and pump housing formation, especially pass through choma behind the impeller, enter the back cavity return port, under the differential pressure action of impeller front and back, be pressed into return line and turn back to return port on the inlet tube, form and reflux, this backflow does not directly enter impeller, can not upset the impeller flow field and distribute, and this return pressure is higher relatively, can improve the cavitation performance of impeller inlet.
The invention has the advantages that: by offer the reflux type of return port at protecgulum and the pump housing, flow direction is consistent in this reflux out flow path direction and impeller, can effectively improve because of the backflow direction that adopts conventional impellers equalizing orifice liquid and come the opposite impeller inlet place current race conditio that causes of flow path direction with impeller.Thereby improve the efficient of pump, reduce the critical NPSH of pump, and effectively improve the pressure pulsation situation at impeller outlet place.Simultaneously position, size and the quantity of the return port that can offer by change reach the optimum efficiency that improves performance.
Description of drawings
Fig. 1: the present invention adopts and offers the reflux schematic representation that return port forms
Fig. 2: the return port place pump housing and pipeline connection diagram
Fig. 3: the axis plane projection schematic representation of return port on the impeller middle spindle face
Fig. 4: the residual heat removal pump reflux type schematic representation that adopts the present invention's design
Among the figure: 1. protecgulum, 2. return port, the 3. pump housing, 4. stator, 5. impeller, 6. impeller nut, 7. choma behind the impeller, 8. return port, 9. return line, 10. bearing bracket stand, 11., 12. impeller preoral loops.
Embodiment
The residual heat removal pump reflux of the present invention's design as shown in Figure 1, is circumferentially evenly offered 5 return ports 2,8 respectively on protecgulum 1, the pump housing 3, fixedly connected with return line 9 two ends respectively, as shown in Figure 2.The return port area is choma 7 and the pump housing 3 interval areas 6 times behind the impeller, and 5 return port 2 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 8 center lines is the inner diameter of 0.55 times of impeller preoral loop 12. Return port 2,8 all begins layout from vertical center line, and with same equal angles
θThe distribution that rotates in a circumferential direction,
θ=72 °.Liquid stream enters the back pump chamber from impeller 5 outlets, arrives the return port 2 of protecgulums 1 by the return line 9 of flowing through of the return port 8 on the pump housing, is mixed into impeller with the import current again, as shown in Figure 4.
On protecgulum 1, the pump housing 3, circumferentially evenly offer 8 return ports 2,8 respectively, fixedly connected with return line 9 two ends respectively, as shown in Figure 2.The return port area is choma 7 and the pump housing 3 interval areas 9 times behind the impeller, and 8 return port 2 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 8 center lines is the inner diameter of 0.65 times of impeller preoral loop 12. Return port 2,8 all begins layout from vertical center line, and with same equal angles
θThe distribution that rotates in a circumferential direction,
θ=45 °.Liquid stream enters the back pump chamber from impeller 5 outlets, arrives the return port 2 of protecgulums 1 by the return line 9 of flowing through of the return port 8 on the pump housing, is mixed into impeller with the import current again, as shown in Figure 4.
On protecgulum 1, the pump housing 3, circumferentially evenly offer 6 return ports 2,8 respectively, fixedly connected with return line 9 two ends respectively, as shown in Figure 2.The return port area is choma 7 and the pump housing 3 interval areas 7 times behind the impeller, and 6 return port 2 place tube sections are axially apart from the distance of the 1.0 times of impeller inlet diameters in impeller inlet limit, and the diameter of 6 return port 8 center lines is the inner diameter of 0.6 times of impeller preoral loop 12. Return port 2,8 all begins layout from vertical center line, and with same equal angles
θThe distribution that rotates in a circumferential direction,
θ=60 °, as shown in Figure 3.Liquid stream enters the back pump chamber from impeller 5 outlets, arrives the return port 2 of protecgulums 1 by the return line 9 of flowing through of the return port 8 on the pump housing, is mixed into impeller with the import current again, as shown in Figure 4.
Claims (5)
1. a nuclear power is with centrifugal residual heat removal pump reflux, comprises choma (7) behind protecgulum (1), the pump housing (3), stator (4), impeller (5), impeller nut (6), the impeller, return line (9), bearing bracket stand (10), axle (11), impeller preoral loop (12); Wherein protecgulum (1), the pump housing (3), stator (4), impeller preoral loop (12), bearing bracket stand (10) are arranged vertically successively, protecgulum (1) is fixedlyed connected with the pump housing (3), the pump housing (3) is fixedlyed connected with stator (4), protecgulum (1) is connected with stator (4) port, and the pump housing (3) is fixedlyed connected with bearing bracket stand (10); Impeller nut (6) is fixed on the axle (11) successively with impeller (5), and can be with respect to protecgulum (1), the pump housing (3), stator (4), bearing bracket stand (10) along circumferentially rotating; The position of impeller (5) center line of discharge is corresponding with stator (4) runner middle section, impeller preoral loop (12) is fixedlyed connected with protecgulum (1), impeller preoral loop (12) adopts Spielpassung with impeller (5), and impeller (5) and the pump housing (3) are by choma (7) Spielpassung behind the impeller; It is characterized in that, circumferentially evenly offering 5-8 return port (8) on the position between choma (7) behind the impeller of the pump housing (3) and the axle (11); Return port (2) is circumferentially evenly offered in upper edge, inlet tube cross section at protecgulum (1), and size, quantity is identical with return port (8), return port (2), return port (8) are fixedlyed connected with return line (9) two ends respectively, and form reflux by return line (9); Fluid flows out from impeller outlet, and through the gap of choma (7) behind the impeller with the pump housing (3), the return port of flowing through (8), return line (9) and return port (2) are got back to impeller inlet.
2. a nuclear power as claimed in claim 1 is with centrifugal residual heat removal pump reflux, it is characterized in that, return port (2) is offered in described inlet tube cross section at protecgulum (1), and described tube section is 0.8-1.2 times of impeller inlet diameter length apart from the distance on impeller inlet limit in the axial direction.
3. a nuclear power as claimed in claim 1 is with centrifugal residual heat removal pump reflux, it is characterized in that, the described return port of offering at the pump housing (3) (8), the diameter of a circle that is surrounded by the center line of return port (8) be impeller preoral loop (12) place diameter 0.55-0.65 doubly.
4. a nuclear power as claimed in claim 1 is characterized in that with centrifugal residual heat removal pump reflux, and the described return port of offering at the pump housing (3) (8) is radially corresponding with the return port of offering at protecgulum (1) (2), as shown in Figure 3.
5. a nuclear power as claimed in claim 1 is characterized in that with centrifugal residual heat removal pump reflux, the gross area of described return port (2), return port (8) be choma (7) and the pump housing (3) interval area behind the impeller 6-9 doubly.
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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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
|---|---|
| CN103277342A true CN103277342A (en) | 2013-09-04 |
| CN103277342B 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088798A (en) * | 2014-06-30 | 2014-10-08 | 广东顺达船舶工程有限公司 | Noise reduction and shock absorption centrifugal pump |
| CN105508302A (en) * | 2016-01-15 | 2016-04-20 | 江苏大学 | Refluxing device for decreasing axial force of centrifugal pump |
| CN112360814A (en) * | 2020-10-09 | 2021-02-12 | 江苏大学 | Stomach type suction tube non-uniform inflow active control device and pump |
| CN114215790A (en) * | 2021-12-29 | 2022-03-22 | 浙江韩益机电有限公司 | Centrifugal pump capable of actively inhibiting cavitation, design method and installation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040223843A1 (en) * | 2003-05-05 | 2004-11-11 | Jose Cabrales | Apparatus, system and method for minimizing resonant forces in a compressor |
| 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 |
-
2013
- 2013-06-24 CN CN201310251695.6A patent/CN103277342B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040223843A1 (en) * | 2003-05-05 | 2004-11-11 | Jose Cabrales | Apparatus, system and method for minimizing resonant forces in a compressor |
| 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 |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088798A (en) * | 2014-06-30 | 2014-10-08 | 广东顺达船舶工程有限公司 | Noise reduction and shock absorption centrifugal pump |
| 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 |
| CN112360814A (en) * | 2020-10-09 | 2021-02-12 | 江苏大学 | Stomach type suction tube non-uniform inflow active control device and 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 |
| CN114215790A (en) * | 2021-12-29 | 2022-03-22 | 浙江韩益机电有限公司 | Centrifugal pump capable of actively inhibiting cavitation, design method and installation method thereof |
| 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 |
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| Publication number | Publication date |
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| CN103277342B (en) | 2015-07-29 |
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Granted publication date: 20150729 |
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