CN207212745U - A kind of cavitation-preventive centrifugal pump closed type impeller structure - Google Patents
A kind of cavitation-preventive centrifugal pump closed type impeller structure Download PDFInfo
- Publication number
- CN207212745U CN207212745U CN201720826557.XU CN201720826557U CN207212745U CN 207212745 U CN207212745 U CN 207212745U CN 201720826557 U CN201720826557 U CN 201720826557U CN 207212745 U CN207212745 U CN 207212745U
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- China
- Prior art keywords
- blade
- impeller
- cavitation
- back shroud
- sealing ring
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Abstract
The utility model patent discloses a kind of cavitation-preventive centrifugal pump closed type impeller structure, including front shroud (104), back shroud (108), blade (101), sealing ring (110), axial connecting hole (109), flow-out hole (102), it is characterised in that：Annular gap be present between sealing ring (110) and pump cover (107)；There are some axial connecting holes (109) on back shroud (108) on the inside of sealing ring (110), the quantity of axial connecting hole (109) is identical with blade (101) quantity, and this hole is led near blade (101) leading edge middle period exhibition along axis direction from back shroud of impeller (108)；Each blade has three flow-out holes (102), will be connected respectively at blade inlet edge front shroud, at middle period exhibition, at back shroud with axial intercommunicating pore (109).Using this impeller, it on the one hand can increase impeller leading edge pressure nearby, reduce the possibility that cavitation erosion occurs, be on the other hand formed about one layer of liquid film in blade, so as to reduce damage of the cavitation erosion to blade.
Description
Technical field：
The utility model patent is related to a kind of centrifugation impeller of pump, and the good centrifugal pump of more particularly to a kind of Cavitation resistant energy closes
Formula impeller.
Background technology：
Cavitation erosion is to restrict hydraulic to high speed, the technical barrier of maximization development.When centrifuging pump operation, liquid
Can not obtain enough energy from pump during entering impeller along pump intake, its flow process along with pressure not
It is disconnected to reduce, and nearby pressure is preferably minimized edge before the impeller.The saturation for being less than the liquid under Current Temperatures when the pressure of liquid is steamed
During steam pressure, vaporization phenomenon will occur for liquid.Centrifugal pump running impeller leading edge minimal pressure force value is often below Current Temperatures
Under saturated vapour pressure, so as to cause the partially liq of impeller leading edge near zone to vaporize.Then part area near impeller
Domain is vaporized occupied by vacuole, and as liquid and vacuole constantly obtain energy along the flowing of impeller channel, its pressure gradually carries
Rise.When pressure is higher than the saturated vapour pressure under Current Temperatures, vaporization vacuole can liquefy again.Because gas and liquid are close
The most diverse of degree, vaporization and liquefaction process are converged along with the moment of liquid in subrange and diffusion, so as to impeller table
Strong high-frequency jet is caused to impact even electrochemical corrosion in face.The destruction to impeller of cavitating not only has influence on the acting of impeller ability
The performance of ability, its breakage not only cause direct economic loss, and also the stable operation to whole system proposes its maintenance process
Challenge.Include three classes still without the improving method for solving this problem, the method for the alleviation cavitation erosion of generally use at present：
(1) impeller is made using anti-cavitation material, is strengthened its anti-cavitation ability；(2) optimization design pump runner and impeller profile
Reduce the possibility to be cavitated in pump；(3) increase entrance servicing unit, lift inlet pressure to a certain extent so as to reduce
Cavitate the possibility occurred.The utility model disclose it is a kind of using highly pressurised liquid be supplemented to impeller leading edge reduce cavitation erosion occur from
Heart pump double shrouded wheel form, a solution is provided to lift the cavitation resistive property of centrifugal pump.
Utility model content：
The utility model provides a kind of cavitation-preventive centrifugal pump closed type impeller structure, to reduce the possibility to be cavitated in pump
Property, improve centrifugal pump Cavitation resistant energy.
In order to achieve the above object, the utility model adopts the following technical scheme that：
A kind of cavitation-preventive centrifugal pump closed type impeller, including front shroud, back shroud, blade, sealing ring, axial connecting hole, go out
Discharge orifice, it is characterised in that：Annular gap between sealing ring and pump cover be present；There are some axially connections on the inside of sealing ring on back shroud
Hole, the quantity of axial connecting hole is identical with blade quantity, and this hole is led in blade inlet edge along axis direction from back shroud of impeller
Near leaf exhibition；Each blade has three flow-out holes, respectively by blade inlet edge front shroud, at middle period exhibition, at back shroud and axial direction
Intercommunicating pore is connected.
The highly pressurised liquid of impeller outlet flows through the annular gap at sealing ring by the gap of back shroud and pump cover, and pressure obtains
To reduction；Liquid continues through axial connecting hole and flow-out hole and quantitatively flowed out from impeller leading edge, before on the one hand can increasing impeller
Nearby pressure reduces the possibility that cavitation erosion occurs to edge, is on the other hand formed about one layer of liquid film in blade so as to reduce cavitation erosion to leaf
The damage of piece.
Cavitation-preventive impeller has the following advantages that compared with prior art disclosed in the utility model：
Structure and manufacturing process are simple, and Cavitation resistant can be good, and the work of balance axial force of impeller can be played while cavitation-preventive
With.
Brief description of the drawings：
Fig. 1 cavitation-preventive centrifugal pump closed type impeller structural representations.
101- blades in figure；102- flow-out holes；103- sealing rings；104- front shrouds；The 105- pump housings；106- spiral cases；107-
Pump cover；108- back shrouds；109- axial directions connecting hole；110- sealing rings；111- axle sleeves；112- packing seals；113- pump shafts.
Embodiment：
The utility model is further illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of cavitation-preventive centrifugal pump closed type impeller, including it is front shroud 104, back shroud 108, blade 101, close
Seal ring 110, axial connecting hole 109, flow-out hole 102, it is characterised in that：In the presence of between annular between sealing ring 110 and pump cover 107
Gap；There are some axial connecting holes 109 on the inner side back shroud 108 of sealing ring 110, quantity and the blade 101 of axial connecting hole 109 count
Measure identical, this hole is led near the leading edge middle period exhibition of blade 101 along axis direction from back shroud of impeller 108；Each blade has three
Individual flow-out hole, it will be connected respectively at blade inlet edge front shroud, at middle period exhibition, at back shroud with axial intercommunicating pore.
Operation principle of the present utility model is：The gap that the highly pressurised liquid of impeller outlet passes through back shroud 108 and pump cover 107
The annular gap at sealing ring 110 is flowed through, pressure is reduced；Liquid continue through axial connecting hole 109 and flow-out hole 102 from
Impeller leading edge quantitatively flows out.In this flow process, along with quantitative elution band of the highly pressurised liquid near the leading edge of blade 101
Nearby Fluid pressure gets a promotion the leading edge of blade 101, and then reduces the possibility that cavitation erosion occurs；In addition, near the leading edge of blade 101
It is stable to go out stream and form one layer of liquid film that destruction when cavitation erosion occurs to blade can be reduced.
Claims (1)
- A kind of 1. cavitation-preventive centrifugal pump closed type impeller structure, mainly by front shroud, back shroud, blade, axially sealing ring, connection Hole, flow-out hole composition, it is characterised in that：Annular gap between sealing ring and pump cover be present；If have on the inside of sealing ring on back shroud Axial connecting hole is done, the quantity of axial connecting hole is identical with blade quantity, and this hole is led to along axis direction from back shroud of impeller Near the exhibition of blade inlet edge middle period；Each blade has three flow-out holes, respectively by blade inlet edge front shroud, at middle period exhibition, bonnet It is connected at plate with axial intercommunicating pore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720826557.XU CN207212745U (en) | 2017-06-30 | 2017-06-30 | A kind of cavitation-preventive centrifugal pump closed type impeller structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720826557.XU CN207212745U (en) | 2017-06-30 | 2017-06-30 | A kind of cavitation-preventive centrifugal pump closed type impeller structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207212745U true CN207212745U (en) | 2018-04-10 |
Family
ID=61812839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720826557.XU Expired - Fee Related CN207212745U (en) | 2017-06-30 | 2017-06-30 | A kind of cavitation-preventive centrifugal pump closed type impeller structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207212745U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876808A (en) * | 2022-04-29 | 2022-08-09 | 左顺彩 | Closed impeller centrifugal pump |
-
2017
- 2017-06-30 CN CN201720826557.XU patent/CN207212745U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876808A (en) * | 2022-04-29 | 2022-08-09 | 左顺彩 | Closed impeller centrifugal pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180410 Termination date: 20190630 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |