CN105782121A - Axial flow pump - Google Patents
Axial flow pump Download PDFInfo
- Publication number
- CN105782121A CN105782121A CN201610214605.XA CN201610214605A CN105782121A CN 105782121 A CN105782121 A CN 105782121A CN 201610214605 A CN201610214605 A CN 201610214605A CN 105782121 A CN105782121 A CN 105782121A
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- CN
- China
- Prior art keywords
- baffle plate
- impeller
- axial
- pump
- flow pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/548—Specially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an axial flow pump. The axial flow pump comprises a pump case (1), an impeller (2) and a plurality of baffles (3), wherein the impeller (2) is placed in the pump case; the baffles (3) are uniformly arrayed on the inner wall of the pump case (1) and positioned at an inlet end of the impeller along the peripheral direction; and front ends of the baffles (3) are streamlined. The axial flow pump can still run efficiently and stably under the working condition of small flow.
Description
Technical field
The invention belongs to fluid machinery technical field, particularly a kind of can under low flow rate condition efficiently, the axial-flow pump of stable operation.
Background technology
Stall problem is one of encountered outstanding problem of Large Axial Flow Pump unit.Axial-flow pump is under low flow rate condition, and flow-lift is unstable, recirculating zone occurs at impeller, and unit vibration is violent, has a strong impact on the safe operation of water pump.Pump assembly stall may cause resonance, the efficient district of water pump also can become narrow simultaneously, in recent years, continuous increase along with unit flow and pump assembly size, the reliability of water pump operation, stability problem also become increasingly conspicuous, and are frequently found the accident that blade occurs that crackle even ruptures in pumping station operation.
Therefore, prior art there is the problem that axial-flow pump under low flow rate condition can not efficiently, stable operation.
Summary of the invention
It is an object of the invention to provide a kind of axial-flow pump, under low flow rate condition, remain to efficient, stable operation.
The technical solution realizing the object of the invention is:
A kind of axial-flow pump, including pump case and the impeller being placed in pump case, also includes multiple baffle plate, and the plurality of baffle plate is circumferentially evenly arranged in the pump housing endophragm of impeller inlet end, and the front end of described baffle plate is streamlined.
The present invention compared with prior art, its remarkable advantage:
Efficient, stable operation is remained under low flow rate condition.Experiments show that, after impeller inlet arranges baffle plate, efficient district lift is substantially free of impact, under low flow rate condition, lift continues to increase with the reduction of flow, has effectively eliminated the saddle area of former flow-lift curve, stable.Meanwhile, at low flow rate condition, pump efficiency is higher than pump efficiency during without baffle plate, and rise about 2%-4%.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of axial-flow pump of the present invention.
Fig. 2 is the outline drawing of baffle plate in Fig. 1.Wherein, Fig. 2 a is front view, and Fig. 2 b is A-A view, and Fig. 2 c is B-B view.
Fig. 3 is the sectional view of pump case inducer in Fig. 1.Wherein, Fig. 3 a is front view, and Fig. 3 b is C-C view.
Fig. 4 is experimental device for verifying figure.
Fig. 5 is the Q-H curve comparison figure of the present invention and prior art.
Fig. 6 is the Q-η curve comparison figure of the present invention and prior art.
In figure, 1 pump case, 2 impellers, 3 baffle plates, 4 wheel hubs, 5 pump shafts, 6 rear guide vanes
Detailed description of the invention
As it is shown in figure 1, axial-flow pump of the present invention, including pump case 1 and the impeller 2 being placed in pump case, also including multiple baffle plate 3, the plurality of baffle plate 3 is circumferentially evenly arranged in pump case 1 inwall of impeller inlet end, and the front end of described baffle plate 3 is streamlined.
As prior art, figure also includes wheel hub 4, pump shaft 5 and rear guide vane 6.
Baffle plate 3 described herein is circumferentially evenly arranged in pump case 1 inwall of impeller inlet end and includes two layers of meaning: one is pump case 1 inwall that multiple baffle plate 3 is evenly arranged in impeller inlet end in the form of a ring, and two is that baffle plate 3 is perpendicular to pump case 1 inwall being attached thereto place.
Preferably, 1/4 elliptic curve that described baffle plate 3 is is major axis with baffle plate 3 and pump case 1 inwall intersection, curve is in face of water (flow) direction.Specifically, fairing member 3 can be a part for elliptic curve, and the major axis of this ellipse is along baffle plate 3 and pump case 1 inwall intersection, and its short axle is vertical with pump case 1 inwall, and the front end of baffle plate 3 is streamline, and along water (flow) direction, rear end is the straight line vertical with pump case 1 inwall.
Found by a large amount of experiments as shown in Figure 4, baffle plate 3 physical dimension steady flow result as shown in Figure 2,3 preferably: the thickness of described baffle plate 3 is 0.01～0.03D, and length is 0.70～0.90D, and width is 0.15～0.25D, and wherein D is impeller diameter.
Being found by a large amount of experiments as shown in Figure 4, baffle plate 3 physical dimension steady flow result as shown in Figure 2,3 is preferably: the thickness of described baffle plate 3 is 0.02D, and length is 0.80D, and width is 0.20D, and wherein D is impeller diameter.
Experiments show that, the distance of described baffle plate 3 rear end and impeller 2 entrance point is 0.10～0.15D, and wherein D is impeller diameter.During this kind of distance, steady flow result is better.When the distance of described baffle plate 3 rear end Yu impeller 2 entrance point is 0.12D, when wherein D is impeller diameter, steady flow result is best.
Considering steady flow result and processing cost, described evenly distributed baffle plate 3 quantity is 3～5.
Optimally, described evenly distributed baffle plate 3 quantity is 4.
The present invention has verified on water conservancy power engineering key lab of the Jiangsu Province transparent testing stand of vertical-type axial-flow pump.As shown in Figure 4, experiment ZM60 axial-flow pump model adopts rustless steel manufacture to pipe-line system, and four blades, impeller diameter D=150mm, hub ratio is d=0.467, and test speed is 2900r/min.
Fig. 5,6 it is the comparison diagram of Q-H, Q-η curve of two kinds of pumps.It can be seen that when impeller inlet is without baffle plate, when water pump operation is to 20L/S conditioned area, lift has decline clearly, and presents the typical shape of a saddle in figure；After impeller inlet arranges baffle plate, efficient district lift being substantially free of impact, under low flow rate condition, lift continues to increase with the reduction of flow, has effectively eliminated the saddle area of former Q-H curve.By Q-η curve chart it can be seen that after impeller inlet arranges baffle plate, efficient district efficiency slightly declines, but amplitude is not as obvious.Under low discharge, pump efficiency is higher than pump efficiency during without baffle plate, and rise about 2%-4%.
Case shows that the present invention enough effectively weakens low flow rate condition impeller inlet backflow development both axially and radially, block the seriality of circumfluence, expand the effective area of passage of current, effect eliminates the saddle area of low flow rate condition performance curve, make Q-H curvilinear motion steady, improve the operational efficiency under axial-flow pump low discharge, have found a kind of simple " stability-enhancement synergistic " method.Meanwhile, the streamlined structure that in the program, the baffle plate of proposition is special can reduce the baffle plate self resistance to current, and can disappear to a certain extent except the baffle plate obstruction to impurities in water dirt.
Claims (8)
1. an axial-flow pump, including pump case (1) and the impeller (2) that is placed in pump case, it is characterized in that: also include multiple baffle plate (3), the plurality of baffle plate (3) is circumferentially evenly arranged in pump case (1) inwall of impeller inlet end, and the front end of described baffle plate (3) is streamlined.
2. axial-flow pump according to claim 1, it is characterised in that: 1/4 elliptic curve that described baffle plate (3) is is major axis with baffle plate (3) and pump case (1) inwall intersection, curve is in face of water (flow) direction.
3. axial-flow pump according to claim 2, it is characterised in that: the thickness of described baffle plate (3) is 0.01～0.03D, and length is 0.70～0.90D, and width is 0.15～0.25D, and wherein D is impeller diameter.
4. axial-flow pump according to claim 3, it is characterised in that: the thickness of described baffle plate (3) is 0.02D, and length is 0.80D, and width is 0.20D, and wherein D is impeller diameter.
5. axial-flow pump according to claim 2, it is characterised in that: the distance of described baffle plate (3) rear end and impeller (2) entrance point is 0.10～0.15D, and wherein D is impeller diameter.
6. axial-flow pump according to claim 5, it is characterised in that: the distance of described baffle plate (3) rear end and impeller (2) entrance point is 0.12D, and wherein D is impeller diameter.
7. axial-flow pump according to claim 1, it is characterised in that: described in baffle plate (3) quantity that is evenly arranged be 3～5.
8. axial-flow pump according to claim 7, it is characterised in that: described in baffle plate (3) quantity that is evenly arranged be 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214605.XA CN105782121A (en) | 2016-04-07 | 2016-04-07 | Axial flow pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214605.XA CN105782121A (en) | 2016-04-07 | 2016-04-07 | Axial flow pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105782121A true CN105782121A (en) | 2016-07-20 |
Family
ID=56394994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610214605.XA Pending CN105782121A (en) | 2016-04-07 | 2016-04-07 | Axial flow pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105782121A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640769A (en) * | 2016-12-01 | 2017-05-10 | 河海大学 | Conical water inflow device for improving instability hydraulic characteristic of axial flow pump |
| CN109538482A (en) * | 2018-10-29 | 2019-03-29 | 江苏大学 | A kind of shaft-driven Multi-stage axial-flow pump of single-motor double |
| CN110566468A (en) * | 2019-09-20 | 2019-12-13 | 江苏大学 | Axial flow pump with double-suction type suction pipe for actively controlling non-uniform incoming flow |
| CN117212230A (en) * | 2023-11-08 | 2023-12-12 | 江苏新世界泵业有限公司 | Speed-adjustable type fluorine material axial flow pump and liquid pumping method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR7504203A (en) * | 1974-07-23 | 1976-07-06 | Itt | DRIVING PUMP |
| JPH08247080A (en) * | 1995-03-14 | 1996-09-24 | Hitachi Ltd | Volute type mixed flow pump |
| CN102330710A (en) * | 2011-09-30 | 2012-01-25 | 扬州大学 | Guide vane exit circulation homogenizer for axial-flow pump and guide vane type mixed-flow pump model |
| JP2012149649A (en) * | 2012-04-23 | 2012-08-09 | Mizota Corp | Axial flow pump or mixed flow pump |
| CN203067358U (en) * | 2013-01-24 | 2013-07-17 | 扬州大学 | Novel open-type water pump water inlet pool |
-
2016
- 2016-04-07 CN CN201610214605.XA patent/CN105782121A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR7504203A (en) * | 1974-07-23 | 1976-07-06 | Itt | DRIVING PUMP |
| JPH08247080A (en) * | 1995-03-14 | 1996-09-24 | Hitachi Ltd | Volute type mixed flow pump |
| CN102330710A (en) * | 2011-09-30 | 2012-01-25 | 扬州大学 | Guide vane exit circulation homogenizer for axial-flow pump and guide vane type mixed-flow pump model |
| JP2012149649A (en) * | 2012-04-23 | 2012-08-09 | Mizota Corp | Axial flow pump or mixed flow pump |
| CN203067358U (en) * | 2013-01-24 | 2013-07-17 | 扬州大学 | Novel open-type water pump water inlet pool |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106640769A (en) * | 2016-12-01 | 2017-05-10 | 河海大学 | Conical water inflow device for improving instability hydraulic characteristic of axial flow pump |
| CN109538482A (en) * | 2018-10-29 | 2019-03-29 | 江苏大学 | A kind of shaft-driven Multi-stage axial-flow pump of single-motor double |
| CN110566468A (en) * | 2019-09-20 | 2019-12-13 | 江苏大学 | Axial flow pump with double-suction type suction pipe for actively controlling non-uniform incoming flow |
| CN110566468B (en) * | 2019-09-20 | 2020-08-28 | 江苏大学 | Axial flow pump with double-suction type suction pipe for actively controlling non-uniform incoming flow |
| CN117212230A (en) * | 2023-11-08 | 2023-12-12 | 江苏新世界泵业有限公司 | Speed-adjustable type fluorine material axial flow pump and liquid pumping method thereof |
| CN117212230B (en) * | 2023-11-08 | 2024-04-05 | 江苏新世界泵业有限公司 | Speed-adjustable type fluorine material axial flow pump and liquid pumping method thereof |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160720 |
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| WD01 | Invention patent application deemed withdrawn after publication |