CN103206412A - Elbow-shaped inlet conduit - Google Patents
Elbow-shaped inlet conduit Download PDFInfo
- Publication number
- CN103206412A CN103206412A CN 201210007886 CN201210007886A CN103206412A CN 103206412 A CN103206412 A CN 103206412A CN 201210007886 CN201210007886 CN 201210007886 CN 201210007886 A CN201210007886 A CN 201210007886A CN 103206412 A CN103206412 A CN 103206412A
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- inlet conduit
- inlet
- water
- elbow
- section
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Abstract
The invention discloses an elbow-shaped inlet conduit, relates to the technical field of key water-control projects, and particularly relates to an inlet conduit structure technology matched with a vertical axial flow pump. The elbow-shaped inlet conduit comprises an inlet section and a water sucking chamber, and is characterized in that the width of the inlet section from the inlet end to the outlet end is increasingly shrunk; the width of the water sucking chamber from the inlet end to the outlet end is increasingly shrunk; the inlet section and the water sucking chamber are in transition connection in a gradual contractive way along the width direction; and the water sucking chamber is shaped like the elbow from the inlet end to the outlet end. According to the elbow-shaped inlet conduit, eddy and other bad flow states in the inlet conduit can be eliminated; velocity distribution at the section of the inlet conduit outlet is uniform; a water flow direction is basically vertical to the section of the outlet; and water power loss in the inlet conduit is smaller. As proved by test results, the flow state of water flow in the inlet conduit is straight and uniform; no flow separation or vortex exists in the bend section of the inlet conduit; the water power loss of an improved inlet conduit is reduced by 0.034m compared with that of the inlet conduit which is not improved under the design flow; and the efficiency of a water pump is increased by over 70%.
Description
Technical field
The present invention relates to the water-control project technical field, particularly with the supporting water inlet flow channel structure technology of vertical-type axial-flow pump.
Background technique
The water inlet flow channel of existing vertical-type axial-flow pump is made up of inducer, suction chamber and oviduct three parts, and oviduct is used for being connected with vertical-type axial-flow pump.After current enter the runner inducer by the forebay, by suction chamber current are guided into around the horn mouth, enter the water pump vane chamber by oviduct again.Discovery water pump in service has intermittent strenuous vibration and bump, even can't work, and is especially more obvious in the unit low lift and large flow rate.According to the test of enlargement discharge on model, impeller inlet has intermittent whirlpool band to produce in the water inlet flow channel, and the whirlpool band enters water pump once, and once vibrations just take place water pump.Because water inlet flow channel does not progressively shrink, amplify on the contrary in turn fractions, therefore produce the backwater district.Model test finds that also water pump inlet part main flow partially on one side, illustrates that the bias current that water pump causes has influence on import always, causes water inlet flow channel very poor to the current rectification effect.
Fluidised form in studies show that in recent years, water inlet flow channel has very big influence to safe, the efficient operation of pumping plant, and common phenomena has: oscillation phenomenon shows, fluidised form disorder in the runner has the whirlpool band to produce, and is particularly even more serious under the low lift and large flow rate operating mode.Cause the unit efficiency of pumping plant to be reduced to about 50% by intrinsic 68%, seriously restricted the performance of water transfer function.
Summary of the invention
The velocity flow profile that the object of the invention is to design a kind of runner exit section as far as possible evenly, water (flow) direction is as far as possible perpendicular to outlet section, the as far as possible little elbow type water inlet flow channel of runner hydraulic loss.
The present invention includes inducer and suction chamber, it is characterized in that the described inducer to outlet end shrinks gradually from entrance point on width direction, described suction chamber from entrance point to outlet end shrinks on width direction gradually, and described inducer is gradually with suction chamber at width direction that the telescopic type transition is connected; Described suction chamber is the elbow type from entrance point to outlet end.
The present invention has cancelled the design of former oviduct, transform plane spiral case bell water inlet flow channel as the elbow water inlet flow channel, directly the outlet end with suction chamber is connected with water pump by seat ring, the present invention can eliminate eddy current and other the bad fluidised form in the runner, the velocity flow profile of runner exit section is even, water (flow) direction is basically perpendicular to the outlet section, and the runner hydraulic loss is less.Test result shows: the flow-shape in the water inlet flow channel is straight evenly, the no separation of flow or vortex in the runner bending section; Under design discharge, the hydraulic loss of the water inlet flow channel after the optimization reduces 0.034m before optimizing, and pump efficiency can be brought up to more than 70%.
Description of drawings
Fig. 1 is of the present invention upright to schematic representation.
Fig. 2 bows to view for Fig. 1's.
Embodiment
As shown in Figure 1, 2, the present invention is made up of pre-large post-small inducer 1 and elbow type suction chamber 2.
Inducer 1 from entrance point to outlet end shrinks on width direction gradually, suction chamber 2 from entrance point to outlet end shrinks on width direction gradually, inducer 1 is gradually with suction chamber 2 at width direction that the telescopic type transition is connected, and suction chamber 2 is the elbow type from entrance point to outlet end.
Claims (1)
1. elbow type water inlet flow channel, comprise inducer and suction chamber, it is characterized in that the described inducer to outlet end shrinks gradually from entrance point on width direction, described suction chamber from entrance point to outlet end shrinks on width direction gradually, and described inducer is gradually with suction chamber at width direction that the telescopic type transition is connected; Described suction chamber is the elbow type from entrance point to outlet end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210007886 CN103206412A (en) | 2012-01-12 | 2012-01-12 | Elbow-shaped inlet conduit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210007886 CN103206412A (en) | 2012-01-12 | 2012-01-12 | Elbow-shaped inlet conduit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103206412A true CN103206412A (en) | 2013-07-17 |
Family
ID=48753759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210007886 Pending CN103206412A (en) | 2012-01-12 | 2012-01-12 | Elbow-shaped inlet conduit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103206412A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595238A (en) * | 2015-01-21 | 2015-05-06 | 扬州大学 | Series of inclined water inlet flow passages with excellent hydraulic performance and application method thereof |
| CN107859630A (en) * | 2017-10-19 | 2018-03-30 | 江苏大学镇江流体工程装备技术研究院 | A kind of vertical pump suction chamber design method |
| CN113323859A (en) * | 2021-07-13 | 2021-08-31 | 上海阿波罗机械股份有限公司 | Test system for nuclear power circulating water pump water inlet runner test |
-
2012
- 2012-01-12 CN CN 201210007886 patent/CN103206412A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104595238A (en) * | 2015-01-21 | 2015-05-06 | 扬州大学 | Series of inclined water inlet flow passages with excellent hydraulic performance and application method thereof |
| CN104595238B (en) * | 2015-01-21 | 2015-11-25 | 扬州大学 | The serial oblique inlet passage of hydraulic performance excellence and application process thereof |
| CN107859630A (en) * | 2017-10-19 | 2018-03-30 | 江苏大学镇江流体工程装备技术研究院 | A kind of vertical pump suction chamber design method |
| CN113323859A (en) * | 2021-07-13 | 2021-08-31 | 上海阿波罗机械股份有限公司 | Test system for nuclear power circulating water pump water inlet runner test |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C05 | Deemed withdrawal (patent law before 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130717 |