CN102927060A - Suction inlet capable of improving centrifugal pump cavitation performance - Google Patents
Suction inlet capable of improving centrifugal pump cavitation performance Download PDFInfo
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- CN102927060A CN102927060A CN2012104319869A CN201210431986A CN102927060A CN 102927060 A CN102927060 A CN 102927060A CN 2012104319869 A CN2012104319869 A CN 2012104319869A CN 201210431986 A CN201210431986 A CN 201210431986A CN 102927060 A CN102927060 A CN 102927060A
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Abstract
The invention discloses a suction inlet capable of improving centrifugal pump cavitation performance and relates to the technical field of centrifugal pump manufacturing. A backflow sleeve (2) is arranged at the position of a pump inlet, the backflow sleeve (2) is formed by internal and external layers of circular-ring-shaped inner and outer rings, the inner diameter of the inner ring of the backflow sleeve is consistent with the size of a pump flow channel, the outer diameter of the inner ring of the backflow sleeve is consistent with the size of the position of the pump inlet of a pump body, and a gap between the inner ring and the outer ring is one twentieth of the outer diameter of the backflow sleeve and used for returning water. Four cube supports are arranged between the inner ring and the outer rings for connecting the inner ring and the outer ring, simultaneously, four threaded holes are uniformly distributed in a peripheral direction in the middle of the backflow sleeve to prevent the longitudinal endplay of the backflow sleeve, and four threaded holes are uniformly distributed in a direction of the backflow sleeve close to the pump inlet to prevent the axial endplay of the backflow sleeve. The suction inlet capable of improving centrifugal pump cavitation performance has the advantages that the structure is simple, the maintenance is convenient and the cavitation performance of the pump can be effectively improved.
Description
Technical field
The invention belongs to centrifugal pump manufacturing technology field, particularly a kind of suction port that improves cavitation performance of centrifugal pump.
Background technique
In centrifugal pump, cavitation is a kind of common phenomenon, cavitation can cause blade destruction, induced vibration and noise, lower efficiency, thereby increase the operation and maintenance cost of pump.The main cause that cavitation produces: when pump is in large flow operation, fluid backflow whirlpool appears in suction eye, segment fluid flow is entered by suction casing, flow to the impeller eye place owing to can't enter impeller, can before suction eye, produce turbulent flow, whirlpool, and because the generation of whirlpool, so that the internal fluid pressure decreased, temperature rises, thereby cavitation phenomenons occurs.
Through retrieval, patent application related to the present invention has: anti-cavitation centrifugal pump (publication number: CN101968064A), a small amount of high pressure water drawn get back to impeller eye, and by nozzle to impeller eye low pressure area injection, improve the low pressure area pressure of impeller eye, thereby avoid the generation of mercury vapour erosion, but after highly pressurised liquid is introduced into entrance, mix one with entrance liquid, cause dozen liquid measure to reduce, thereby affect the working efficiency of pump.
Anti-cavitation double-suction middle-opened centrifugal pump (publication number: CN102042232A), the impeller both sides are provided with inducer, inducer is provided with without the cone spiral vane of plunderring the angle, so that inlet blade angle and exit angle are easily adjusted, anti-cavitation performance is good, but need to change existing structure, make and install comparatively complicated.
Method (the publication number: CN101734345A) of cavitation generation and flow separation in the inhibition blade of liquid machine, on blade inlet edge or blade, produce easily the low pressure area of cavitation or flow separation, the mounted movable surface, cause the blade surface local motion, thereby realize inhibition or the control of cavitation and separated flow, but manufacturing is comparatively complicated, and owing to change original blade structure, so efficient is lower.
Summary of the invention
Technical problem to be solved by this invention is, existing centrifugal pump is under the lower-capacity point operating mode, the cavitation performance of pump is relatively poor, the efficient of pump is low, has proposed a kind of suction port that improves cavitation performance of centrifugal pump, can reduce NPSH under the prerequisite that does not affect efficient.
Technological scheme of the present invention is: a kind of suction port that improves cavitation performance of centrifugal pump comprises the backflow cover for reducing net positive suction head.(being suction passage) increases the cover that refluxes between pump intake and impeller eye, the cover that will reflux is positioned over apart from the 0.5 times of impeller inlet diameter in impeller inlet place place, namely the backflow cover outside one end is 0.5 times of impeller inlet diameter length apart from the distance of the outer at pump intake place, and liquid is for the impact in impeller inlet flow field in the anti-backflow cover.The cover that refluxes is inside and outside two-layer circular interior ring and outer shroud composition, the interior internal diameter that encircles of the cover that refluxes is consistent with the pump channel size, interior external diameter and the pump housing pump intake place consistent size of encircling of the cover that refluxes, gap between interior ring and the outer shroud is 1/20th of the cover external diameter that refluxes, be the flow channel of backwater, the axial two ends of interior ring each than short 20 of the cover external diameter that refluxes of outer shroud/
OneLength is the import and export of backwater; Ring and outer shroud in 4 cube support and connection are arranged between interior ring and the outer shroud; Simultaneously, uniform 4 tapped holes of circumferencial direction in the middle of the cover that refluxes, the cover (2) that will reflux overlaps vertical vibration by screw and the fixing anti-backflow of pump intake, beat uniform 4 tapped holes at the cover that refluxes near the pump inlet direction, the cover (2) that will reflux is fixed anti-backflow sleeve to vibration by screw and pump intake.
When pump is in the large-capacity point operation; flow into medium and be divided into two-part; a part flows directly into impeller eye through the spacer internal diameter, and another part liquid flows into impeller eye by the pump housing and spacer gap, because former waterpower does not have change; do not flow into impeller so can not affect medium; pump efficiency is without any variation, simultaneously, because the existence of spacer fully mixes the gas breaking in the medium with medium; played and reduced the cavitation effect, effectively protected impeller port ring and sealing.And be in when moving than lower-capacity point when pump, the redundance medium is back to pump housing ingress through the cover that refluxes, and this moment, pump housing ingress total discharge did not change, and the phenomenon of rear deceleration do not appear accelerating in fluid, whirlpool therefore can not occur; Simultaneously, because reflux fluid pressure impels the impeller eye hydrodynamic pressure to raise, improve the ability of pump anti-cavitation.
Description of drawings
Fig. 1 is the schematic three dimensional views that the present invention refluxes and overlaps.
Backwater cover work schematic representation when Fig. 2 is large flow.
Backwater cover work schematic representation when Fig. 3 is small flow.
Among the figure: 1. the pump housing, 2. backwater cover, 3. impeller, 4. impeller nut, 5. pump cover, 6. mechanical seal, 7. pump shaft.
Embodiment
In conjunction with Fig. 1, centrifugal entrance structure of the present invention comprises the backflow cover for reducing net positive suction head, the cover that refluxes is inside and outside two-layer circular interior ring and outer shroud composition, the interior internal diameter that encircles of the cover that refluxes is consistent with the pump channel size, interior external diameter and the pump housing pump intake place consistent size of encircling of the cover that refluxes, gap between interior ring and the outer shroud is 1/20th of the cover external diameter that refluxes, flow channel for backwater, each 1/20th length than the short cover external diameter that refluxes of outer shroud of the axial two ends of interior ring is the import and export of backwater; Ring and outer shroud in 4 cube support and connection are arranged between interior ring and the outer shroud.Other structures of centrifugal pump of the present invention repeat no more with centrifugal pump structure was identical in the past.
In conjunction with Fig. 2; when pump is in and moves than large-capacity point; flow into medium and be divided into two-part, a part flows directly into impeller eye through the spacer internal diameter, and another part liquid flows into impeller eye by the pump housing and spacer gap; because former waterpower does not have change; do not flow into impeller so can not affect medium, pump efficiency is without any variation, simultaneously; because the existence of spacer fully mixes the gas breaking in the medium with medium, played and reduce cavitation and also effectively protected impeller port ring and sealing.
In conjunction with Fig. 3, be in the import of pump that (being suction passage) flow to the impeller eye medium after increasing the cover that refluxes between pump intake and the impeller eye, the redundance medium is back to pump housing ingress through the cover that refluxes.This moment, pump housing ingress total discharge did not change, because the phenomenon of rear deceleration does not appear accelerating in medium, whirlpool can not occur.Resulting vibration and cavitation phenomenons disappear.And reflux medium pressure impels the impeller eye pressure medium to raise, and has improved the ability of the anti-cavitation of pump.
Claims (2)
1. suction port that improves cavitation performance of centrifugal pump, it is characterized in that, the cover (2) that refluxes is set in the runner at pump intake place, described backflow cover (2) is that inside and outside two-layer circular interior ring and outer shroud form, the interior internal diameter that encircles of the cover that refluxes is consistent with the pump channel size, interior external diameter and the pump housing pump intake place consistent size of encircling of the cover that refluxes, gap between interior ring and the outer shroud is 1/20th of the cover external diameter that refluxes, flow channel for backwater, each 1/20th length than the short cover external diameter that refluxes of outer shroud of the axial two ends of interior ring is the import and export of backwater; Ring and outer shroud in 4 cube support and connection are arranged between interior ring and the outer shroud; Simultaneously, uniform 4 tapped holes of circumferencial direction in the middle of the cover that refluxes, the cover (2) that will reflux overlaps vertical vibration by screw and the fixing anti-backflow of pump intake, beat uniform 4 tapped holes at the cover that refluxes near the pump inlet direction, the cover (2) that will reflux is fixed anti-backflow sleeve to vibration by screw and pump intake.
2. a kind of suction port that improves cavitation performance of centrifugal pump according to claim 1 is characterized in that, described backflow cover (2) outside one end is 0.5 times of impeller inlet diameter length apart from the distance of the outer at pump intake place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210431986.9A CN102927060B (en) | 2012-11-02 | 2012-11-02 | A kind of suction port improving cavitation performance of centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210431986.9A CN102927060B (en) | 2012-11-02 | 2012-11-02 | A kind of suction port improving cavitation performance of centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102927060A true CN102927060A (en) | 2013-02-13 |
| CN102927060B CN102927060B (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210431986.9A Active CN102927060B (en) | 2012-11-02 | 2012-11-02 | A kind of suction port improving cavitation performance of centrifugal pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939896A (en) * | 2017-05-04 | 2017-07-11 | 项光辉 | A kind of digital metering non-return centrifugal pump of high leakproofness |
| CN108050109A (en) * | 2018-01-08 | 2018-05-18 | 浙江理工大学 | A kind of centrifugal pump and its method of work for inhibiting cavitation |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4375937A (en) * | 1981-01-28 | 1983-03-08 | Ingersoll-Rand Company | Roto-dynamic pump with a backflow recirculator |
| US4854818A (en) * | 1987-12-28 | 1989-08-08 | Rockwell International Corporation | Shrouded inducer pump |
| US4930979A (en) * | 1985-12-24 | 1990-06-05 | Cummins Engine Company, Inc. | Compressors |
| CN1542289A (en) * | 2003-04-30 | 2004-11-03 | 奥尔塞特工程有限公司 | Compressor |
| CN102619775A (en) * | 2012-03-20 | 2012-08-01 | 江苏大学 | Core tube capable of inhibiting centrifugal pump inlet backflow |
| CN202883498U (en) * | 2012-11-02 | 2013-04-17 | 江苏大学 | Suction inlet of improving centrifugal pump cavitation performances |
-
2012
- 2012-11-02 CN CN201210431986.9A patent/CN102927060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4375937A (en) * | 1981-01-28 | 1983-03-08 | Ingersoll-Rand Company | Roto-dynamic pump with a backflow recirculator |
| US4930979A (en) * | 1985-12-24 | 1990-06-05 | Cummins Engine Company, Inc. | Compressors |
| US4854818A (en) * | 1987-12-28 | 1989-08-08 | Rockwell International Corporation | Shrouded inducer pump |
| CN1542289A (en) * | 2003-04-30 | 2004-11-03 | 奥尔塞特工程有限公司 | Compressor |
| CN102619775A (en) * | 2012-03-20 | 2012-08-01 | 江苏大学 | Core tube capable of inhibiting centrifugal pump inlet backflow |
| CN202883498U (en) * | 2012-11-02 | 2013-04-17 | 江苏大学 | Suction inlet of improving centrifugal pump cavitation performances |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939896A (en) * | 2017-05-04 | 2017-07-11 | 项光辉 | A kind of digital metering non-return centrifugal pump of high leakproofness |
| CN108050109A (en) * | 2018-01-08 | 2018-05-18 | 浙江理工大学 | A kind of centrifugal pump and its method of work for inhibiting cavitation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102927060B (en) | 2015-12-02 |
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Application publication date: 20130213 Assignee: Gaoyou Gaonong Machinery Parts Co., Ltd. Assignor: Jiangsu University Contract record no.: 2018320000109 Denomination of invention: Suction inlet capable of improving centrifugal pump cavitation performance Granted publication date: 20151202 License type: Exclusive License Record date: 20180515 |
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| EE01 | Entry into force of recordation of patent licensing contract |