CN108019359B - Jet centrifugal pump with separation net enhanced self-priming - Google Patents
Jet centrifugal pump with separation net enhanced self-priming Download PDFInfo
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- CN108019359B CN108019359B CN201711477421.3A CN201711477421A CN108019359B CN 108019359 B CN108019359 B CN 108019359B CN 201711477421 A CN201711477421 A CN 201711477421A CN 108019359 B CN108019359 B CN 108019359B
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- gas
- separation net
- centrifugal
- backflow
- liquid
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- 238000000926 separation method Methods 0.000 title claims abstract description 98
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 239000012530 fluid Substances 0.000 claims abstract description 31
- 238000005381 potential energy Methods 0.000 claims abstract description 8
- 230000005514 two-phase flow Effects 0.000 claims abstract description 6
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 230000002708 enhancing effect Effects 0.000 abstract description 3
- 238000009792 diffusion process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D9/00—Priming; Preventing vapour lock
- F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
- F04D9/06—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock of jet type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Abstract
The invention discloses a jet centrifugal pump with a separation net for enhancing self-priming. The invention comprises a jet centrifugal pump and a separation net, wherein the separation net is arranged in a gas-liquid separation chamber and is arranged between a backflow flow channel inlet and a centrifugal volute chamber outlet, gas-liquid two-phase flow which flows back to the backflow flow channel inlet in the gas-liquid separation chamber is effectively separated in a certain relative space attitude and a interception area, meanwhile, fluid which is originally jetted from a centrifugal outlet in the gas-liquid separation chamber and has very strong kinetic energy is rectified by the separation net, the speed and the pressure are reduced and increased, the pressure potential energy of the backflow fluid and the overall uniformity of flow in the separation chamber are improved, the gas content of the backflow fluid flowing back to an ejector nozzle through the backflow flow channel is obviously reduced, and the speed of gas-liquid mixing and gas-liquid separation is simultaneously accelerated, so that the self-priming capability of the jet self-priming centrifugal pump is obviously improved.
Description
Technical Field
The invention relates to an injection type centrifugal pump, in particular to an injection type centrifugal pump with a separation net for enhancing self-suction, and belongs to the field of fluid machinery.
Background
The pump is a universal machine with wide range and huge energy consumption, and almost all places where liquid flows are operated. According to statistics of the China general mechanical society, the annual average total output value of the national pump industry in recent years is more than 1000 hundred million yuan, and the power consumption of the water pump accounts for about 20 percent of the national power consumption. At present, the low-noise self-priming composite pump (application number: 201610813048.3; application publication number CN 106224249A) disclosed in various small land pump products is a novel, low-noise, efficient and energy-saving pump product, namely a novel jet centrifugal pump. Compared with the vortex pump and jet pump which are dominant in the existing small land pump market, the pump has the advantages of high self-priming capability, high suction stroke, low noise, large flow and high efficiency, has wide application prospect in various industrial fields such as water supply heating, tap water pressurization, mining machinery, ship manufacturing, petrochemical industry and the like, and has huge market potential and remarkable energy-saving and noise-reducing effects.
However, in the disclosed low-noise self-priming composite pump, since the gas-liquid two-phase flow of the centrifugal outlet is similar to that of a circular tube jet with an inclined angle in the self-priming stage, the main flow area of the jet is mostly opposite to the inlet of the backflow channel, the distance between the centrifugal outlet and the inlet of the backflow channel is generally impossible to be too large due to the comprehensive consideration of the volume, efficiency and cost of the pump body, and then the bubbles thrown out into the gas-liquid separation chamber by the impeller tend to be difficult to escape and separate along with the main flow, and are forced to flow into the backflow inlet again to be brought into the impeller again, and are sheared into smaller-size bubbles by the centrifugal impeller again. Along with the deep self-priming process, the pressure of the pump inlet is lower and the cavitation allowance is smaller, and in addition, bubbles in the gas-liquid separation chamber cannot be separated in time and discharged out of the water body, so that the reflux working fluid is provided with a large number of bubbles, the generation of cavitation in the pump is further aggravated, the gas at the pump inlet cannot be smoothly sucked into the ejector to be mixed with the reflux fluid, the self-priming speed and the self-priming height are finally reduced under the influence of the two adverse mechanisms, and even the phenomenon of 'gas binding' occurs in severe cases, so that the self-priming function is completely lost.
Disclosure of Invention
Aiming at the defects of unstable self-priming capability and poor self-priming speed consistency of a low-noise self-priming composite pump, the invention provides an injection type centrifugal pump with a separation net for enhancing self-priming speed and self-priming height and improving self-priming stability.
The invention aims to reasonably distribute the space relative positions of the separation net in the gas-liquid separation chamber by selecting the separation net with proper geometric shape and dimension, globally optimize the flow uniformity and flow direction in the gas-liquid separation chamber, control and accelerate the separation of gas-liquid two phases, thereby improving the self-priming capability of the jet centrifugal pump.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention comprises an injection type centrifugal pump and a separation net, wherein the separation net is arranged in a gas-liquid separation chamber and is arranged between a backflow flow channel inlet and a centrifugal volute chamber outlet, gas-liquid two-phase flow which flows back to the backflow flow channel inlet in the gas-liquid separation chamber is effectively separated by a certain relative space posture and a interception area S, meanwhile, fluid which is originally ejected from a centrifugal outlet in the gas-liquid separation chamber and has strong kinetic energy is rectified by the separation net, the pressure potential energy of the backflow fluid and the whole uniformity of flow in the separation chamber are improved, the gas-containing rate of the backflow fluid flowing back to an injector nozzle through the backflow flow channel is obviously reduced, the two most critical flow processes in the self-priming stage of the gas-liquid separation of the gas-liquid mixing-gas-liquid separation chamber in a diffusion pipe are smoother, and the self-priming capacity of the injection type centrifugal pump is obviously improved.
The interception area S of the separation net is 20% -100% of the cross section area of the gas-liquid separation chamber which is perpendicular to the flow direction along the flow direction position of the separation net.
The boundary shape of the separation net can be the cross section boundary of the gas-liquid separation chamber along the position of the separation net, or the boundary can be not overlapped with the boundary, but a certain gap is reserved, or the separation net is in a regular rectangular, round, elliptic cylindrical surface and other shapes.
The mesh of the separation net can be rectangular, square, triangular, polygonal, circular and any other shape, or a combination of meshes with various shapes.
The separation net can also be any three-dimensional space curved surface.
Compared with the prior art, through adopting above technical scheme, the beneficial effect who has is:
according to the difference of the relative spatial positions of a centrifugal outlet and a backflow flow channel inlet in a gas-liquid separation chamber and the flow characteristics of an integral flow field in the separation chamber, a separation net which is provided with blocking bubbles and modulating fluid flow is arranged between the centrifugal outlet and the backflow flow channel inlet, so that on one hand, the gas-liquid separation in the gas-liquid separation chamber is ensured to be more controllable, the gas content of circulating working fluid flowing back to a nozzle is greatly reduced, the carried momentum is maintained at a higher level, a good boundary condition can be created for the formation of continuous strong negative pressure at the nozzle outlet, and the gas at the inlet section of a self-priming stage can be continuously injected into a diffusion pipe by the negative pressure, and the equivalent flow is maintained; on the other hand, the separation net can enhance gas-liquid separation in the gas-liquid separation chamber, reduce bubble backflow, regulate fluid flow, convert fluid kinetic energy of the centrifugal outlet into pressure potential energy, reduce interference of turbulent flow in the separation chamber on floating of bubbles, reduce submergence of bubbles along with downward fluid, and greatly improve exhaust efficiency and exhaust speed in the limited space of the gas-liquid separation chamber. In addition, the separation net can reduce the influence of the centrifugal outlet direction on the flow of the backflow fluid and the internal circulation flow of the jet centrifugal pump, improve the stability of the self-circulation pressurizing and self-suction capacity of the jet centrifugal pump, and reduce the defective rate of products.
The separation net is simple to manufacture, can be manufactured by adopting various engineering materials or metals, and has low cost, low difficulty in processing and manufacturing processes and wide technical popularization and industrialization prospect. The self-priming height and speed of the jet centrifugal pump are improved, the stability of the pump performance can be ensured, and the influence on the whole pump characteristics such as the flow-lift and the flow-efficiency of the pump is very small.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a vertical arrangement of an ejector of the ejector centrifugal pump of the present invention;
FIG. 2 is a schematic view of a portion of the separation net of FIG. 1 in detail;
FIG. 3 is a schematic longitudinal cross-sectional view of a horizontal arrangement of an ejector of the ejector centrifugal pump of the present invention;
reference numerals: 1. a separation net; 2. an ejector centrifugal pump inlet; 3. a jet centrifugal pump body; 4. an outlet of the jet centrifugal pump; 5. a return flow channel inlet; 6. a return flow path; 7. a nozzle; 8. a diffusion tube; 9. a gas-liquid separation chamber; 10. a centrifugal impeller inlet; 11. a centrifugal impeller; 12. a centrifugal volute; 13. a centrifugal flow passage outlet; 14. a partition tongue; 15. a motor; 16. and a centrifugal volute diversion section.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and thorough description of the present invention will be rendered by reference to the appended drawings, in which only some, but not all embodiments of the invention are illustrated. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
As shown in fig. 1 to 3, the present invention comprises a jet centrifugal pump body 3 (a jet centrifugal pump inlet 2 and a jet centrifugal pump outlet 4 with a rear side), a centrifugal impeller 11, a jet comprising a nozzle 7 and a diffuser pipe 8, and a separation net 1. According to the difference of the relative spatial positions of the centrifugal flow channel outlet 13 and the return flow channel inlet 5 in the gas-liquid separation chamber 9 and the flow characteristics of the integral flow field in the separation chamber 9, a separation net 1 for blocking bubbles and modulating the flow of fluid is arranged between the centrifugal outlet and the return flow channel inlet. On the one hand, the gas-liquid separation in the gas-liquid separation chamber is ensured to be more controllable, so that the gas content of the circulating working fluid flowing back to the nozzle is greatly reduced, the carried momentum is maintained at a higher level, a good precondition can be created for the formation of continuous and strong negative pressure at the outlet of the nozzle 7, and the gas at the inlet section of the self-priming stage can be continuously injected into the diffusion tube 8 by the negative pressure, and the equivalent flow is maintained. On the other hand, the separation net 1 can enhance gas-liquid separation in the gas-liquid separation chamber, reduce bubble backflow, modulate fluid flow in the separation chamber 9, convert fluid kinetic energy of the centrifugal flow channel outlet 13 into pressure potential energy, reduce interference of turbulent flow in the separation chamber on bubble floating, reduce descending of bubbles along with downward fluid, and greatly improve exhaust efficiency and exhaust speed in the limited space of the gas-liquid separation chamber 9.
The self-priming stage is driven by the impeller, the fluid in the centrifugal volute obtains considerable pressure potential energy and kinetic energy, and jet flow with strong kinetic energy is formed near the outlet of the centrifugal runner. At the same time, the centrifugal pump sucks the gas in the pump inlet 2 by the stronger negative pressure near the outlet of the nozzle 7, enters the diffusion section 8 to mix with the backflow fluid, passes through the centrifugal impeller inlet 10 and finally flows into the centrifugal impeller 11 in the centrifugal volute 12, the centrifugal impeller 11 is driven by the motor 15, and the centrifugal volute 12 is internally provided with the partition tongue 14. The jet formed by the centrifugal flow channel outlet 13, which is prolonged by the flow guiding section of the centrifugal volute, contains the gas sucked by the pump inlet 2 and the bubbles mixed in the return fluid to return to the ejector during the self-priming phase. It is clear that too high a gas-containing rate of the return fluid will affect the overall gas-liquid mixing and gas-liquid separation of the pump, ultimately resulting in a reduction in self-priming height and speed. The separation net 1 is arranged inside the gas-liquid separation chamber 9 and is arranged between the backflow channel inlet 5 and the centrifugal channel outlet 13, and gas-liquid two-phase flow which flows back to the backflow channel inlet 5 in the gas-liquid separation chamber 9 is effectively separated in a certain relative space posture and a interception area S. The fluid ejected from the original centrifugal flow passage outlet 13 in the gas-liquid separation chamber 9 is rectified by utilizing a separation net, the speed and the pressure are reduced, the pressure potential energy of the fluid in the backflow flow passage 6 and the overall uniformity of the flow in the separation chamber 9 are improved, the air content of the backflow fluid flowing back to the ejector nozzle 7 through the backflow flow passage 6 is reduced, the pressure potential energy of the backflow fluid is higher, the two most critical flowing processes in the circulating flow of the self-priming stage of the jet centrifugal pump in the gas-liquid mixing-gas-liquid separation chamber 9 of the diffusion pipe 8 are smoother, and the speed of the gas-liquid mixing and the gas-liquid separation is simultaneously accelerated, so that the self-priming capacity of the jet self-priming centrifugal pump is remarkably improved.
In summary, the invention provides a method and a separation device for comprehensively optimizing two-phase flow in a gas-liquid separation chamber by utilizing a separation net based on the novel low-noise composite pump disclosed by the invention, and the gas-liquid separation can be scientifically controlled, so that the self-priming speed and the self-priming height of the jet centrifugal pump are effectively improved on the basis of not obviously increasing the manufacturing cost and the process difficulty.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a centrifugal pump of injection type with separation net reinforcing is from inhaling, includes centrifugal pump body of injection type and separation net, its characterized in that: the separation net is arranged in the gas-liquid separation chamber, is arranged between the inlet of the backflow flow channel and the outlet of the centrifugal volute chamber, and is used for effectively separating gas and liquid of gas-liquid two-phase flow which flows back to the inlet of the backflow flow channel in the gas-liquid separation chamber in a certain relative space attitude and interception area, and simultaneously, the separation net is used for rectifying fluid which is originally ejected out of the centrifugal outlet in the gas-liquid separation chamber and has very strong kinetic energy, so that the pressure potential energy of the backflow fluid and the overall uniformity of flow in the separation chamber are improved, and the air content of the backflow fluid which flows back to the ejector nozzle through the backflow flow channel is obviously reduced;
the interception area of the separation net is 20% -100% of the cross section area of the gas-liquid separation chamber which is perpendicular to the flow direction along the flow direction position of the separation net;
the boundary shape of the separation net is the cross-section boundary shape of the gas-liquid separation chamber along the plane of the separation net, or is not overlapped with the boundary, and a gap is reserved.
2. The centrifugal ejector pump with separation net enhanced self-priming according to claim 1, wherein: the separation net is a regular rectangle, a circle, an ellipse or a cylindrical surface.
3. The centrifugal ejector pump with separation net enhanced self-priming according to claim 1, wherein: the grids of the separation net are rectangular, triangular, isosceles, circular or a combination of multiple grids.
4. The centrifugal ejector pump with separation net enhanced self-priming according to claim 1, wherein: the separation net is any three-dimensional space curved surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711477421.3A CN108019359B (en) | 2017-12-29 | 2017-12-29 | Jet centrifugal pump with separation net enhanced self-priming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711477421.3A CN108019359B (en) | 2017-12-29 | 2017-12-29 | Jet centrifugal pump with separation net enhanced self-priming |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108019359A CN108019359A (en) | 2018-05-11 |
| CN108019359B true CN108019359B (en) | 2024-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711477421.3A Active CN108019359B (en) | 2017-12-29 | 2017-12-29 | Jet centrifugal pump with separation net enhanced self-priming |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661919A (en) * | 2018-06-26 | 2018-10-16 | 中国计量大学 | Jet pump with gas-liquid separation device |
| CN108726695A (en) * | 2018-07-06 | 2018-11-02 | 国合凯希水体修复江苏有限公司 | Microbubble dissolves disperser |
| CN110821840A (en) * | 2019-10-25 | 2020-02-21 | 中国计量大学 | Self-suction enhanced compound pump of intelligent super-hydrophobic bubble trap |
| WO2023279689A1 (en) * | 2021-07-05 | 2023-01-12 | 陈荣国 | Direct current permanent magnet self-priming composite shielding pump |
| CN113586458B (en) * | 2021-08-30 | 2023-06-09 | 陈荣国 | Self-priming multi-stage composite shielding pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000345987A (en) * | 1999-06-07 | 2000-12-12 | Matsushita Electric Ind Co Ltd | Self-priming pump |
| CN106224249A (en) * | 2016-09-09 | 2016-12-14 | 浙江新控泵业有限公司 | Low noise self-priming combination pump |
| CN207715378U (en) * | 2017-12-29 | 2018-08-10 | 台州天计流体科技有限公司 | A kind of jet centrifugal pump with separate mesh enhancing self-priming |
-
2017
- 2017-12-29 CN CN201711477421.3A patent/CN108019359B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000345987A (en) * | 1999-06-07 | 2000-12-12 | Matsushita Electric Ind Co Ltd | Self-priming pump |
| CN106224249A (en) * | 2016-09-09 | 2016-12-14 | 浙江新控泵业有限公司 | Low noise self-priming combination pump |
| CN207715378U (en) * | 2017-12-29 | 2018-08-10 | 台州天计流体科技有限公司 | A kind of jet centrifugal pump with separate mesh enhancing self-priming |
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| CN108019359A (en) | 2018-05-11 |
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