CN203297136U - Axial force balancing device of centrifugal residual heat removal pump for nuclear power - Google Patents
Axial force balancing device of centrifugal residual heat removal pump for nuclear power Download PDFInfo
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- CN203297136U CN203297136U CN2013203169417U CN201320316941U CN203297136U CN 203297136 U CN203297136 U CN 203297136U CN 2013203169417 U CN2013203169417 U CN 2013203169417U CN 201320316941 U CN201320316941 U CN 201320316941U CN 203297136 U CN203297136 U CN 203297136U
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- impeller
- pump
- axial force
- nuclear power
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Abstract
The utility model discloses an axial force balancing device of a centrifugal residual heat removal pump for nuclear power. The axial force balancing device of the centrifugal residual heat removal pump for nuclear power comprises an impeller (1), a guide vane (2), a pump cover (3), a shaft sleeve (4), a spline shaft (5), a locking spacer (6) and an impeller nut (7). The axial backflow mode can improve the efficiency of the pump, the critical net positive suction head of the pump is reduced, and the situation of pressure pulsation in the outlet portion of the impeller is effectively improved. Due to the design of a gear groove of a hub of the impeller, the leakage of liquid is greatly reduced and the efficiency of the pump is improved. The spline shaft is high in strength and the centering performance of the impeller is good so that the vibration of the pump can be effectively controlled. Due to the design of the special locking spacer, the phenomenon that the impeller nut is loosened can be effectively eliminated and the purpose that the axial force is adjusted to the minimum degree can be achieved through the change of the area and the number of balancing holes.
Description
Technical field
The utility model is the cooperating structure device of a kind of impeller and axle, is applicable to the axial force balance of hydraulic machinery receded disk impeller, refers in particular to a kind of radially reflux type axial thrust balancing devices of nuclear power with centrifugal residual heat removal pump.
Background technique
Million kilowatt nuclear power belongs to the core 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.It 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, and has become the biggest problem of 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 uniform liquid enter annular delivery chamber, to eliminate the balance radial force.Impeller front and back choma is set, and on impeller, offers the size that equalizing orifice is adjusted axial force, make pump shaft usually be in less tension and rush state.
Because nuclear power is had relatively high expectations with pump, associated documents stipulate this kind of pump in minimum discharge to all stable operation and be not subjected to the impact of changes in flow rate in the peak rate of flow scope, and under any operating mode of regulation, cavitation does not occur all.As shown in Figure 4, adopt traditional balance unit for pump axial force, while namely on impeller, offering equalizing orifice, backflow direction and impeller incoming flow opposite direction by impeller balance hole liquid, destroyed normal flowing state, cause impeller inlet place liquid stream disorderly, may cause the efficiency of pump and anti-cavitation performance to descend, and form abnormal vibrations and noise.Therefore, the novel suitable nuclear power of research is the problem that realizes the necessary solution of this kind pump production domesticization institute with the axial thrust balancing devices of residual heat removal pump.
Through retrieval, during about balance centrifugal residual heat removal pump axial force, the dentation impeller hub that the utility model adopts---balancing axial thrust and raise the efficiency device and there is no relevant report radially refluxes.
The model utility content
The purpose of this utility model is with centrifugal residual heat removal pump, to provide a kind of axial force balancing device for nuclear power, what while solve adopting the conventional balanced hole reflux of pump, exist lowers efficiency, reduces cavitation performance and produce the problems such as vibration noise, thereby completes safety and stability and the efficient operation of residual heat removal pump.
The technological scheme that its technical problem that solves the utility model adopts is: comprise impeller, stator, pump cover, axle sleeve, splined shaft, locked spacer, impeller nut.Impeller and pump cover form forward and backward pump chamber, impeller hub and splined shaft spline joint, axle sleeve and impeller nut carry out axially locating to impeller hub, and the impeller hub keyway degree of depth is greater than the height of spline axle key, in impeller hub, form axial return flow line, on locked spacer, have radially return port.The pod apertures of axle sleeve, the axially passage between return flow line, splined shaft and axle sleeve and radially backflow of the formation of the radially return port on locked spacer, the axial force of ballast pump.
Liquid at impeller outlet flows to into forward and backward pump chamber, and the liquid stream that enters in front pump chamber returns impeller channel by preoral loop, enters choma after the liquid circulation in rear pump chamber, and flows back to impeller inside by return port radially, and the backflow direction comes flow path direction consistent with impeller.The front and back pump chamber produces into pressure reduction, thereby forms a kind of axial force balance mode, and reaches the purpose that improves pump efficiency, reduction device net positive suction head and reduce vibration noise.
The marginal position of impeller hub is processed into the serrate slot shape, and " gear grooved " of impeller hub is evenly distributed on the circumference of impeller hub together, when vane rotary; " gear grooved " can be to the acting of liquid stream; by the hole on pump cover, liquid stream is delivered in the rear pump chamber between pump cover and impeller again; can greatly reduce the leakage of liquid stream, thereby improves the efficiency of pump.Between impeller and splined shaft, by spline joint, reach the purpose of circumferential location, and form axial return flow line, axle sleeve carries out axially locating to impeller together with impeller nut, the nut loosening that may cause while preventing the pump counter-rotating by locked spacer between impeller nut and impeller.
The layout of parts that the utility model comprises is: pump chamber after forming between impeller and pump cover offers pod apertures and the liquid stream that enters rear pump chamber can be transported to the cavity volume of " gear grooved " on pump cover.Impeller circumferentially is fixed on splined shaft by spline joint, axially by bearing one side, by axle sleeve, fix, opposite side fixes by impeller nut and locked spacer, the outer surface of impeller nut forms the stream interface that seamlessly transits with back shroud of impeller, locked spacer is arranged between impeller nut and impeller and prevents that impeller nut is loosening, and by offering return port radially, regulates the size of axial force.
Working procedure is: nuclear power is delivered to eminence with the vane rotary generation lift of centrifugal residual heat removal pump by liquid, the liquid stream at most of impeller outlet place enters spiral case by stator and is collected and delivers to delivery side of pump, sub-fraction liquid enters pump chamber, forms and refluxes balancing axial thrust.The working procedure of the utility model liquid stream is also like this: impeller outlet place liquid flows to into rear pump chamber, then by pod apertures on pump cover and axle sleeve, enters " gear grooved " cavity volume.After this, after liquid in a part " gear grooved " cavity volume is done work by gear grooved, again be delivered to the rear pump chamber between pump cover and impeller, another part liquid enters impeller hub and splined shaft forms return flow line, finally through the radially return port on locked spacer, enters impeller.The leakage of liquid reduces greatly like this, and the flow path direction that refluxes out is consistent with the Flow in Impeller direction, can raise the efficiency.The size of axial force can be adjusted balance by the size of the radially return port area on locked spacer.
The utility model has the advantage of: radially reflux type can improve the efficiency of pump, reduces the critical NPSH of pump, and effectively improves the pressure pulsation situation at impeller outlet place." gear grooved " design of impeller hub can greatly reduce the leakage of liquid stream, improves the efficiency of pump.The intensity of splined shaft is large, and the centering of impeller is good, thus the effectively vibration of control pump.Special locked spacer design can be eliminated the loosening phenomenon of impeller nut effectively, and can, by changing area and the quantity of equalizing orifice, reach and regulate axial force to minimum purpose.
The accompanying drawing explanation
Fig. 1: the radially reflux type axial thrust balancing devices that the utility model adopts.
Fig. 2: the spline joint schematic diagram between axle and impeller hub.
Fig. 3: the residual heat removal pump axial force balance reflux type that adopts the utility model design.
Fig. 4: traditional residual heat removal pump axial force balance reflux type.
In figure: 1. impeller, 2. stator, 3. pump cover, 4. axle sleeve, 5. splined shaft, 6. locked spacer, 7. impeller nut, 8. impeller hub, 9. axle, 10. axial return flow line, 11. impeller hubs " gear grooved ".
Embodiment
In conjunction with Fig. 1, adopt the radially return port axial thrust balancing devices of the utility model design, axle sleeve 4 is offered pod apertures, splined shaft 5 and impeller 1 are by spline joint and form axial return flow line 10, liquid stream enters impeller by the radially return port of offering on locked spacer 6, forms radially reflux type and regulates axial force.Impeller 1 wheel hub marginal position is processed into the serrate slot shape, form gear grooved 11, after liquid in a part " gear grooved " cavity volume is done work by gear grooved, again be delivered to the rear pump chamber between pump cover 3 and impeller 1, another part liquid enters the return flow line 10 of impeller hub 8 and splined shaft 5 formation, finally through the radially return port on locked spacer 6, enters impeller 1.
In conjunction with Fig. 2, between the axle of employing the utility model design and impeller hub, adopt spline joint, the depth ratio conventional spline of the wheel hub upper spline groove of impeller 1 is wanted dark 3～4mm, the impeller hub 8 keyway degree of depth are greater than the key length of splined shaft 5, in impeller hub 8, form axial return flow line 10, to keep the passage of liquid stream axial flow.
In conjunction with Fig. 4, in Fig. 4, black arrow has represented the flow direction of liquid stream, and traditional nuclear power is directly offered equalizing orifice on impeller 1 with centrifugal residual heat removal pump, liquid stream directly axially enters impeller by rear pump chamber, with incoming flow opposite direction in impeller, cause the impeller inlet movement disorder, lower efficiency.
In conjunction with Fig. 3, in Fig. 3, black arrow has represented the flow direction of liquid stream, adopt the radially return port axial thrust balancing devices of the utility model design, liquid stream enters rear pump chamber from impeller 1 outlet, by the pod apertures on pump cover 3 and axle sleeve 4, enter " gear grooved " cavity volume, then through splined shaft 5 and the passage that impeller hub 8 forms, finally through the radially return port on locked spacer 6, enter impeller.
Claims (4)
1. a nuclear power goes out balance unit for pump axial force with the centrifugal type residual hot type, comprise impeller (1), stator (2), pump cover (3), axle sleeve (4), splined shaft (5), locked spacer (6) and impeller nut (7), it is characterized in that, impeller (1) forms forward and backward pump chamber with pump cover (3); Between splined shaft (5) and impeller hub (8), form axial return flow line (10); Shown in locked spacer (6) be provided with radially return port; Axle sleeve (4) is provided with pod apertures; Radially return port on the pod apertures of rear pump chamber, axle sleeve (4), axial return flow line (10) and locked spacer (6) forms radially return flow line, the axial force of ballast pump.
2. a kind of nuclear power according to claim 1 goes out balance unit for pump axial force with the centrifugal type residual hot type, it is characterized in that, the edge of described impeller hub (8) is the serrate slot shape, and gear grooved (11) circumferentially is evenly distributed on the circumference of impeller hub (8).
3. a kind of nuclear power according to claim 1 goes out balance unit for pump axial force with the centrifugal type residual hot type, it is characterized in that, described impeller hub (8) and splined shaft (5) spline joint, and impeller (1) the wheel hub keyway degree of depth, greater than the key length of splined shaft (5), forms axial return flow line (10).
4. a kind of nuclear power according to claim 1 goes out balance unit for pump axial force with the centrifugal type residual hot type, it is characterized in that, locked spacer (6) be arranged between impeller nut (7) and impeller (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203169417U CN203297136U (en) | 2013-06-04 | 2013-06-04 | Axial force balancing device of centrifugal residual heat removal pump for nuclear power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203169417U CN203297136U (en) | 2013-06-04 | 2013-06-04 | Axial force balancing device of centrifugal residual heat removal pump for nuclear power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203297136U true CN203297136U (en) | 2013-11-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203169417U Withdrawn - After Issue CN203297136U (en) | 2013-06-04 | 2013-06-04 | Axial force balancing device of centrifugal residual heat removal pump for nuclear power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203297136U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277334A (en) * | 2013-06-04 | 2013-09-04 | 江苏大学 | Axial force balance device for centrifugal residual heat removal pump for nuclear power |
| CN112762006A (en) * | 2021-01-20 | 2021-05-07 | 浙江理工大学 | Centrifugal pump impeller with adjustable balance hole state |
| CN113410954A (en) * | 2021-05-21 | 2021-09-17 | 成都凯天电子股份有限公司 | Self-circulation wet test motor for aviation electric pump |
-
2013
- 2013-06-04 CN CN2013203169417U patent/CN203297136U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277334A (en) * | 2013-06-04 | 2013-09-04 | 江苏大学 | Axial force balance device for centrifugal residual heat removal pump for nuclear power |
| CN103277334B (en) * | 2013-06-04 | 2016-05-25 | 江苏大学 | A kind of nuclear power goes out balance unit for pump axial force with centrifugal type residual hot type |
| CN112762006A (en) * | 2021-01-20 | 2021-05-07 | 浙江理工大学 | Centrifugal pump impeller with adjustable balance hole state |
| CN112762006B (en) * | 2021-01-20 | 2022-09-09 | 浙江理工大学 | Centrifugal pump impeller with adjustable balance hole state |
| CN113410954A (en) * | 2021-05-21 | 2021-09-17 | 成都凯天电子股份有限公司 | Self-circulation wet test motor for aviation electric pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131120 Effective date of abandoning: 20160525 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |