CN100547249C - Prevent cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms - Google Patents
Prevent cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms Download PDFInfo
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- CN100547249C CN100547249C CNB200510014712XA CN200510014712A CN100547249C CN 100547249 C CN100547249 C CN 100547249C CN B200510014712X A CNB200510014712X A CN B200510014712XA CN 200510014712 A CN200510014712 A CN 200510014712A CN 100547249 C CN100547249 C CN 100547249C
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- centrifugal pump
- jetting device
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Abstract
The invention discloses a kind of seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation, comprise centrifugal pump, centrifugal delivery side of pump connects the entry end of liquid liquid liquid jetting device and the entry end of gas-liquid liquid jetting device respectively by threeway, and the outlet end of liquid liquid liquid jetting device is connected with the inlet of centrifugal pump.When the negative cavity suction port with liquid liquid liquid jetting device is connected with the liquid phase part of fresh-water generator, when part connects mutually with the gas-liquid of the negative cavity suction port of gas-liquid liquid jetting device and fresh-water generator, just constitute seawater desalination system of the present invention.The present invention adopts a centrifugal pump to cooperate two liquid jetting devices to realize preventing that cavitation in centrifugal pump and vacuum from forming, and can reduce the equipment setting height(from bottom), and saving equipment drops into, and saves entire system power consumption, can be widely used in distillation sea water law desalination system.
Description
Technical field
The invention belongs to field of sea water desalting technology, particularly a kind of seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation is used for the distillation sea water desalting system.
Background technique
In multistage flash evaporation or multiple-effect distillation sea water desalting device, the vacuum evaporation condensation is main technology phenomenon, owing to bring the various fixed gas (oxygen of dissolving in the seawater into, nitrogen etc.) and the air that leaks of equipment hermetic unit all need fixed gas to be discharged system with vacuum pump or other device, and the temperature of afterbody or last effect is in the time of 40 ℃, the absolute pressure of system is at 0.0073MPa, fluid under this pressure to be discharged, equipment must have enough setting height(from bottom)s, such as, under this condition fresh water (or dense water) is discharged automatically, the equipment setting height(from bottom) must be above 9.6 meters; When cavitation in centrifugal pump surplus during at 5m, the equipment setting height(from bottom) must be more than 5.33m.Can be said to be passable for horizontal distillation equipment, but the vertical still desalting plant last imitate as reach more than the 5m, then the integral device height can be higher, on island or other open region equipment wind resistance, anti-lightning strike design and construction can bring inconvenience.Therefore, the research and development centrifugal pump is very necessary with the fresh water in the vertical sea water by distillation desalting plant (or dense water) continuous blow-down method.
CN01267811.2 discloses a kind of device that prevents cavitation in centrifugal pump, comprise the conical outlet chamber that is arranged on the centrifugal pump water intake, this device is in the threeway of centrifugal pump outlet, a modulating valve that outlet is connected with threeway, be connected with modulating valve, and the loop branch pipe that leads to the conical outlet chamber, the other end of loop branch pipe has convergent nozzle.But equipment and pump joint will be transformed common equipment.In addition, when this method was used for the equipment inner chamber and is vacuum system, reflux fluid may partly flow in the equipment cavity, has directly increased the centrifugal pump load.Other measure that improves the cavitation resistive property of centrifugal pump own has: (1) improves pump intake near the structural design the impeller.Increase area of passage; Increase the radius of curvature of impeller cover inducer, reduce liquid stream and sharply quicken and step-down; Suitably reduce the thickness of blade import, and, make it, also can reduce the acceleration and the step-down of streaming leaf head near streamline with blade import cavetto; Improve impeller and blade inlet part surface finishment to reduce drag losses; Entrance edge of blade is extended to impeller inlet, make liquid stream accept work done in advance, improve pressure.(2) adopt preposition inducer, make the work done in advance in preposition inducer of liquid stream, to improve flow stream pressure.(3) adopt double-entry impeller, allow liquid stream enter impeller simultaneously from the impeller both sides, then the import cross section doubles, and inlet velocity can reduce one times.(4) design conditions adopt big slightly high incidence, to increase inlet blade angle, reduce the bending of blade inlet, reduce blade and block, to increase inlet-duct area; Improve the operating conditions under the big flow, to reduce flow losses.But high incidence is unsuitable excessive, otherwise influences efficient.(5) adopt the anti-material that cavitates.Practice shows that the intensity of material, hardness, toughness are high more, and chemical stability is good more, and the performance of anti-cavitation erosion is strong more.But what these methods had can partly improve cavitation erosion gold amount, and what have must transform original equipment, complex structure, and practical level is low.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of and prevents cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms, and this device can prevent cavitation in centrifugal pump, can direct part or all replace vacuum system.
For solving above-mentioned technical problem to be solved, the seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation of the present invention comprises centrifugal pump.Described centrifugal delivery side of pump connects the entry end of liquid liquid liquid jetting device and the entry end of gas-liquid liquid jetting device respectively by threeway; The outlet end of described liquid liquid liquid jetting device is connected with the inlet of described centrifugal pump; The negative cavity suction port of described liquid liquid liquid jetting device is used for being connected with the liquid phase part of outside fresh-water generator, and the negative cavity suction port of described gas-liquid liquid jetting device is used for the gas-liquid part connection mutually with outside fresh-water generator.
Be provided with modulating valve between the entry end of described centrifugal delivery side of pump and liquid liquid liquid jetting device.
Compared with prior art, the present invention has following beneficial effect: (one) the present invention adopts a centrifugal pump to cooperate two liquid jetting devices to realize preventing that cavitation in centrifugal pump and vacuum from forming, can reduce the equipment setting height(from bottom), saving equipment drops into, and saves entire system power consumption; (2) the present invention can be widely used in distillation sea water law desalination system, the requirement that restriction and cavitation in centrifugal pump surplus can reduction equipment be installed, can carry out simultaneously system's fixed gas discharging and effectively reduce equipment input and the operating cost that forms device by vacuum pump or other vacuum, in small-sized distillation system for desalination even can save other vacuum formation device; (3) be provided with easy for installation, reliable.
Description of drawings
Fig. 1 prevents cavitation in centrifugal pump for the present invention and prevents the structural representation of the seawater desalination auxiliary device that vacuum forms.
Reference character:
1-fresh-water generator 2-liquid liquid liquid jetting device 3-centrifugal pump 4-modulating valve 5-gas-liquid liquid jetting device
Embodiment
Below in conjunction with drawings and Examples the present invention is elaborated.
Embodiment:
As shown in Figure 1, the seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation of the present invention is made up of a centrifugal pump and two liquid jetting devices.The outlet of centrifugal pump 3 connects the entry end of liquid liquid liquid jetting device 2 and the entry end of gas-liquid liquid jetting device 5 respectively by threeway.The outlet end of liquid liquid liquid jetting device 2 is connected with the inlet of centrifugal pump 3.The inlet of centrifugal pump 3 is that reflux part and conflux with liquid liquid liquid jetting device negative cavity fluid forms.Be provided with modulating valve 4 between the entry end of the outlet of centrifugal pump 3 and liquid liquid liquid jetting device 2, modulating valve 4 is used to control capacity of reflux.Gas-liquid liquid jetting device 5 power resources are the centrifugal pumps that prevent the cavitation in centrifugal pump system, two shared centrifugal pumps of system.
When with the preventing cavitation in centrifugal pump and prevent that seawater desalination auxiliary device that vacuum forms is applied to seawater desalination system of present embodiment, need the negative cavity suction port of liquid liquid liquid jetting device 2 is connected with the liquid phase part of outside fresh-water generator 1, with the gas-liquid partly connection mutually of negative cavity suction port with the fresh-water generator 1 of outside of gas-liquid liquid jetting device 5.
Working procedure when the present invention is applied to seawater desalination system is as follows:
Liquid phase fluid in the fresh-water generator 1 sucks through the negative cavity suction port of liquid liquid liquid jetting device 2, converges the centrifugal pump 3 of together being made a gift to someone with liquid liquid liquid jetting device 2 axial high speed fluids, and the modulating valve 4 that is arranged on liquid liquid liquid jetting device front end is used to control capacity of reflux.The fluid on centrifugal pump main line sucks the negative cavity of gas-liquid liquid jetting device 5 through gas-liquid liquid jetting device 5 with the gas phase fixed gas in the fresh-water generator 1 and discharges with liquid phase fluid fresh water (or dense water).Like this, by a centrifugal pump, when finishing the conveying of desalination apparatus liquid, the fixed gas of finishing in the desalination apparatus is discharged.
Claims (2)
1, a kind of seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation comprises centrifugal pump, and it is characterized in that: described centrifugal delivery side of pump connects the entry end of liquid liquid liquid jetting device and the entry end of gas-liquid liquid jetting device respectively by threeway; The outlet end of described liquid liquid liquid jetting device is connected with the inlet of described centrifugal pump; The negative cavity suction port of described liquid liquid liquid jetting device is used for being connected with the liquid phase part of outside fresh-water generator, and the negative cavity suction port of described gas-liquid liquid jetting device is used for the gas-liquid part connection mutually with outside fresh-water generator.
2, a kind of seawater desalination auxiliary device that prevents cavitation in centrifugal pump and prevent vacuum formation according to claim 1 is characterized in that: be provided with modulating valve between the entry end of described centrifugal delivery side of pump and liquid liquid liquid jetting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510014712XA CN100547249C (en) | 2005-08-04 | 2005-08-04 | Prevent cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200510014712XA CN100547249C (en) | 2005-08-04 | 2005-08-04 | Prevent cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1752464A CN1752464A (en) | 2006-03-29 |
| CN100547249C true CN100547249C (en) | 2009-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510014712XA Expired - Fee Related CN100547249C (en) | 2005-08-04 | 2005-08-04 | Prevent cavitation in centrifugal pump and prevent the seawater desalination auxiliary device that vacuum forms |
Country Status (1)
| Country | Link |
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| CN (1) | CN100547249C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968064A (en) * | 2010-11-17 | 2011-02-09 | 重庆大学 | Anti-cavitation centrifugal pump |
| CN103185369A (en) * | 2012-08-20 | 2013-07-03 | 哈尔滨工大金涛科技股份有限公司 | Directly heating machine |
| CN104893964B (en) * | 2015-06-26 | 2017-04-19 | 北京中持绿色能源环境技术有限公司 | High-solid anaerobic fermentation tank and jet stirring device for same |
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2005
- 2005-08-04 CN CNB200510014712XA patent/CN100547249C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1752464A (en) | 2006-03-29 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091007 Termination date: 20120804 |