CN102927060B - A kind of suction port improving cavitation performance of centrifugal pump - Google Patents
A kind of suction port improving cavitation performance of centrifugal pump Download PDFInfo
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- CN102927060B CN102927060B CN201210431986.9A CN201210431986A CN102927060B CN 102927060 B CN102927060 B CN 102927060B CN 201210431986 A CN201210431986 A CN 201210431986A CN 102927060 B CN102927060 B CN 102927060B
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- inner ring
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- backflow cover
- outer shroud
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Abstract
The invention discloses a kind of suction port improving cavitation performance of centrifugal pump, relate to centrifugal pump manufacturing technology field.Backflow cover (2) is set at pump intake place, described backflow cover (2) is inside and outside two-layer circular inner ring and outer shroud composition, the internal diameter of backflow cover inner ring is consistent with pump channel size, the external diameter of backflow cover inner ring and pump housing pump intake place consistent size, gap between inner ring and outer shroud is 1/20th of backflow cover external diameter, for backwater.4 cubes are had to support, for connecting inner ring and outer shroud between inner ring and outer shroud.Meanwhile, uniform 4 tapped holes of circumferencial direction in the middle of backflow cover, anti-backflow overlaps longitudinal vibration, and beat uniform 4 tapped holes at backflow cover near pump inlet direction, anti-backflow sleeve is to vibration.Structure of the present invention is simple, easy to maintenance, and effectively can improve the cavitation performance of pump.
Description
Technical field
The invention belongs to centrifugal pump manufacturing technology field, particularly a kind of suction port improving cavitation performance of centrifugal pump.
Background technique
In centrifugal pump, cavitation is a kind of common phenomenon, and cavitation can cause the destruction of blade, induced vibration and noise, lower efficiency, thus increases the operation and maintenance cost of pump.The main cause that cavitation produces: when pump is in large discharge operation, there is fluid backflow whirlpool in suction eye, segment fluid flow is entered by suction casing, impeller flow to impeller eye place owing to cannot be entered, turbulent flow, whirlpool can be produced before suction eye, and due to the generation of whirlpool, internal fluid pressure be reduced, temperature rises, thus occurs cavitation phenomenons.
Through retrieval, patent application related to the present invention has: anti-cavitation centrifugal pump (publication number: CN101968064A), a small amount of high pressure water is led back impeller eye, and by nozzle to impeller eye low pressure area injection, improve the low pressure area pressure of impeller eye, thus avoid the generation of pump cavitation, but after highly pressurised liquid is introduced into entrance, with Inlet fluid mixing one, cause and play liquid measure reduction, thus affect the working efficiency of pump.
Anti-cavitation double-suction middle-opened centrifugal pump (publication number: CN102042232A), impeller both sides are provided with inducer, inducer is provided with the cone spiral vane without plunderring angle, inlet blade angle and exit angle are easily adjusted, anti-cavitation performance is good, but need to change existing structure, manufacture and install comparatively complicated.
Suppress the method (publication number: CN101734345A) of cavitation generation and flow separation in blade of liquid machine, in front of the blade edge or blade easily produce the low pressure area of cavitation or flow separation, mounted movable surface, cause blade surface local motion, thus realize suppression or the control of cavitation and separated flow, but manufacturing is comparatively complicated, and owing to changing original blade structure, therefore efficiency is lower.
Summary of the invention
Technical problem to be solved by this invention is, under existing centrifugal pump is in lower-capacity point operating mode, the cavitation performance of pump is poor, the efficiency of pump is low, proposes a kind of suction port improving cavitation performance of centrifugal pump, can reduce NPSH under the prerequisite not affecting efficiency.
Technological scheme of the present invention is: a kind of suction port improving cavitation performance of centrifugal pump, comprises the backflow cover for reducing net positive suction head.Between pump intake and impeller eye, (i.e. suction passage) increases backflow cover, backflow cover is positioned over distance impeller inlet diameter place of 0.5 times, impeller inlet place, namely backflow cover lateral ends is 0.5 times of impeller inlet diameter length apart from the distance of the outer at pump intake place, and in anti-backflow cover, liquid is for the impact in impeller inlet flow field.Backflow cover is inside and outside two-layer circular inner ring and outer shroud composition, the internal diameter of backflow cover inner ring is consistent with pump channel size, the external diameter of backflow cover inner ring and pump housing pump intake place consistent size, gap between inner ring and outer shroud is 1/20th of backflow cover external diameter, for the flow channel of backwater, the axial two ends of inner ring respectively backflow cover external diameter shorter in outer shroud 20/
onelength is the import and export of backwater; 4 cube support and connection inner ring and outer shroud is had between inner ring and outer shroud; Simultaneously, uniform 4 tapped holes of circumferencial direction in the middle of backflow cover, backflow cover (2) is fixed anti-backflow by screw and pump intake and overlaps longitudinal vibration, beat uniform 4 tapped holes at backflow cover near pump inlet direction, backflow cover (2) is fixed anti-backflow sleeve to vibration by screw and pump intake.
When pump is in large-capacity point operation; flow into medium and be divided into two-part; a part flows directly into impeller eye through spacer internal diameter, and another part liquid flows into impeller eye, because former waterpower does not have change by gap between the pump housing and spacer; therefore medium inflow impeller can not be affected; pump efficiency without any change, meanwhile, because the gas breaking in medium fully mixes with medium by the existence of spacer; serve and reduce cavitation effect, effectively protect impeller port ring and sealing.And when pump is in comparatively lower-capacity point operation, redundance medium is back to pump housing ingress through backflow cover, now pump housing ingress total discharge does not change, and the phenomenon accelerating rear deceleration does not appear in fluid, therefore there will not be whirlpool; Meanwhile, because reflux fluid pressure impels impeller eye hydrodynamic pressure to raise, improve the ability of pump anti-cavitation.
Accompanying drawing explanation
Fig. 1 be the present invention reflux cover schematic three dimensional views.
Backwater cover operating diagram when Fig. 2 is large discharge.
Backwater cover operating diagram when Fig. 3 is small flow.
In figure: 1. the pump housing, 2. backwater cover, 3. impeller, 4. impeller nut, 5. pump cover, 6. mechanical seal, 7. pump shaft.
Embodiment
Composition graphs 1, centrifugal entrance structure of the present invention comprises the backflow cover for reducing net positive suction head, backflow cover is inside and outside two-layer circular inner ring and outer shroud composition, the internal diameter of backflow cover inner ring is consistent with pump channel size, the external diameter of backflow cover inner ring and pump housing pump intake place consistent size, gap between inner ring and outer shroud is 1/20th of backflow cover external diameter, for the flow channel of backwater, 1/20th length of each backflow cover external diameter shorter in outer shroud in the axial two ends of inner ring is the import and export of backwater; 4 cube support and connection inner ring and outer shroud is had between inner ring and outer shroud.Other structures of centrifugal pump of the present invention, with centrifugal pump structure was identical in the past, repeat no more.
Composition graphs 2; when pump is in comparatively large-capacity point operation; flow into medium and be divided into two-part, a part flows directly into impeller eye through spacer internal diameter, and another part liquid flows into impeller eye by gap between the pump housing and spacer; because former waterpower does not have change; therefore can not affect medium flow into impeller, pump efficiency without any change, simultaneously; because the gas breaking in medium fully mixes with medium by the existence of spacer, serve and reduce cavitation and effectively protect impeller port ring and sealing.
Composition graphs 3, be in after (i.e. suction passage) between pump intake and impeller eye increases backflow cover in the import of pump and flow to impeller eye medium, redundance medium is back to pump housing ingress through backflow cover.Now pump housing ingress total discharge does not change, and because the phenomenon accelerating rear deceleration does not appear in medium, there will not be whirlpool.Resulting vibration and cavitation phenomenons disappear.And reflux medium pressure impels impeller eye pressure medium to raise, and improves the ability of the anti-cavitation of pump.
Claims (1)
1. one kind is improved the suction port of cavitation performance of centrifugal pump, it is characterized in that, backflow cover (2) is set in the runner at pump intake place, described backflow cover (2) is circular inner ring and circular outer shroud composition, the internal diameter of backflow cover inner ring is consistent with pump channel size, the external diameter of backflow cover inner ring and pump housing pump intake place consistent size, gap between inner ring and outer shroud is 1/20th of backflow cover external diameter, for the flow channel of backwater, 1/20th length of each backflow cover external diameter shorter in outer shroud in the axial two ends of inner ring is the import and export of backwater; 4 cube support and connection inner ring and outer shroud is had between inner ring and outer shroud; Simultaneously, uniform 4 tapped holes of circumferencial direction in the middle of backflow cover, backflow cover (2) is fixed anti-backflow by screw and pump intake and overlaps longitudinal vibration, at backflow cover near uniform 4 tapped holes in pump inlet direction, backflow cover (2) is fixed anti-backflow sleeve to vibration by screw and pump intake; Described backflow cover (2) lateral ends 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 CN102927060A (en) | 2013-02-13 |
| CN102927060B true CN102927060B (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106939896B (en) * | 2017-05-04 | 2024-06-18 | 温州市康而达实业有限公司 | High-tightness digital metering non-return centrifugal pump |
| CN108050109B (en) * | 2018-01-08 | 2024-08-23 | 山西天海给排水设备有限公司 | Centrifugal pump capable of inhibiting cavitation and working method thereof |
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 |
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| CN102927060A (en) | 2013-02-13 |
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| EE01 | Entry into force of recordation of patent licensing contract |
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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