CN105909567A - Jet device capable of improving cavitation performance of jet type centrifugal pump - Google Patents

Jet device capable of improving cavitation performance of jet type centrifugal pump Download PDF

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Publication number
CN105909567A
CN105909567A CN201610431975.9A CN201610431975A CN105909567A CN 105909567 A CN105909567 A CN 105909567A CN 201610431975 A CN201610431975 A CN 201610431975A CN 105909567 A CN105909567 A CN 105909567A
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China
Prior art keywords
jet
trunnion
ejector
centrifugal pump
type centrifugal
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CN201610431975.9A
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CN105909567B (en
Inventor
李贵东
王洋
赵立峰
冒杰云
曹璞钰
胡日新
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Jiangsu University
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Jiangsu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/10—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)

Abstract

The invention relates to a jet device capable of improving the cavitation performance of a jet type centrifugal pump. The jet device comprises a nozzle, a flow guide section, a mixing section, a hollow tube, a dispersing section and a pressure increasing hole. According to the jet device, when the jet type centrifugal pump runs under a large-flow-rate working condition, the pressure increasing hole designed in the hollow tube of the jet device can guide high pressure liquid from a pump chamber into a low pressure area in the hollow tube, so that the pressure of the low pressure area of the hollow tube can be increased, the cavitation which leads to vibration and noise in the hollow tube of the jet device can be inhibited, and the phenomenon that the lift of the jet type centrifugal pump decreases sharply due to the cavitation occurring in the hollow tube of the jet device can be reduced; a lift stopping point can be deviated close to large flow rate, so that the running range of the jet type centrifugal pump can be expanded.

Description

A kind of ejector improving jet-type centrifugal pump cavitation performance
Technical field
The present invention relates to the critical piece ejector of a kind of jet-type centrifugal pump, be related specifically to one and can improve jet-type centrifugal pump The ejector of cavitation performance.
Background technology
Jet-type centrifugal pump is a kind of electric pump using ejector and the design of centrifugal pump compound mode, and it has compact conformation, operation Convenience, restarting are without pouring water, without installing bottom valve, can realize the advantages such as self-priming, at gardens drip irrigation, agricultural sprinkling irrigation constant pitch Water system is widely used.Compared with conventional centrifugal pump, the operation logic of jet-type centrifugal pump: go out stream from pump stator and enter pump chamber Highly pressurised liquid form parital vacuum by injection stream at mixing section, make the liquid in pump water inlet pipeline logical under atmospheric pressure effect Cross Drainage Section and enter the mixing section of ejector, and then the liquid mixing gone out with injection stream, jointly through trunnion, diffuser flow into from Lobus cardiacus wheel is also discharged from stator, and wherein, a part of liquid discharges pump chamber, another part liquid then by ejector import continue with In inlet tube, liquid mixing flows into impeller, such circular flow.Particularity based on jet-type centrifugal pump operation principle, according to grinding Studying carefully discovery, in running, jet-type centrifugal pump internal pressure extreme lower position produces in trunnion region, and this just determines such The cavitation of pump does not occurs at impeller inlet, and is to occur at a certain position of ejector trunnion.Along with the increase of flow, jet Jet-type centrifugal pump lift is caused drastically to decline generation cavitation inside device trunnion, induced vibration and noise simultaneously, limit it Flow operating range.
Therefore, design is a kind of in big flow running, by the highly pressurised liquid in pump chamber is introduced ejector throat region, In order to increase the pressure in this region, and then the ejector improving jet-type centrifugal pump cavitation performance is most important.
Summary of the invention
It is an object of the invention to provide a kind of ejector improving jet-type centrifugal pump cavitation performance, including nozzle, Drainage Section, Mixing section, trunnion, diffuser and pressurized hole.A number of pressurized hole is offered, by the height in pump chamber at ejector trunnion position Press liquid introduces ejector trunnion area of low pressure, and in order to increase the pressure in this region, suppression ejector trunnion is internal occurs cavitation to lure Send out vibration, noise, improve ejector trunnion internal generation cavitation and cause jet-type centrifugal pump lift drastically to decline phenomenon, will raise Journey snap point, to big flow excursion, increases the flow operating range of jet-type centrifugal pump.
For achieving the above object, the present invention uses following scheme:
First according to design requirement, nozzle diameter is determined
D 1 = 4 Q 1 3.14 μ 2 g α Δp 0 γ
In formula: Q1For nozzle injection flow, wherein, nozzle injection flow Q1Equal to centrifugal impeller inlet flow rate Q0Deduct pump to enter Mouth flow Q2, centrifugal impeller inlet flow rate Q0With pump inlet flow Q2Can draw according to jet-type centrifugal pump design requirement；
μ is solid particle and liquid velocity slip correction factor, and in water medium, its numerical value is 1；
α is ejector trunnion import function, and empirical value takes 1～1.05；
Δp0For the pressure differential of nozzle inlet Yu Drainage Section import department, Drainage Section inlet pressure can be approximately pressure at pump inlet；
γ is the unit weight of liquid.
And then determine:
Throat pipe diameter:Wherein, area ratio R represents the ratio of throat area and nozzle area, its value and stream Measuring and be correlated with than M, flow-rate ratio M represents centrifugal impeller inlet flow rate Q0With nozzle injection flow Q1Ratio；
Nozzle cylindrical outlet length: L1=(0.3～0.5) D1；
Larynx mouth is away from L2=(0.5～1) D2, the larynx mouth distance away from the length for mixing section, i.e. jet expansion to trunnion import；
Length of throat: L3=(1.5～3) D2；
Diffuser length: L4=(2～5) D2, wherein, L4Being determined by diffusion angle beta, β takes 5 °～8 °.
In such scheme, pressurized hole is to trunnion import distance L0With length of throat L3Ratio be 1/6～1/2.
In such scheme, in pressurized hole, liquid goes out flow path direction and should be advisable to flow impact loss with trunnion, i.e. can reduce as far as possible Pressurized hole is θ with the direction of trunnion wall angle, 30 °≤θ≤90 °.
In such scheme, pressurized hole diameter D0With throat pipe diameter D2Ratio be 1/20～1/12.
In such scheme, pressurized hole number 2≤N≤4, and circumferencial direction is uniformly distributed.
The invention has the beneficial effects as follows:
Using the ejector of this structure, can be effectively improved when big flow rate working conditions runs, ejector trunnion is internal occurs cavitation to lure The vibration and noise sent out；When improving the operation of big flow rate working conditions, ejector trunnion is internal occurs cavitation to cause lift drastically to decline and ask Topic, by lift snap point to big flow excursion, increases the range of operation of jet-type centrifugal pump.
Accompanying drawing explanation
Fig. 1 is the jet-type centrifugal pump schematic diagram of existing two kinds of different jet device structures, figure (a) be ejector be penetrating of straight tube-like Flow centrifugal pump, figure (b) is the jet-type centrifugal pump of ejector band bend pipe；
Fig. 2 is the ejector schematic diagram of existing two kinds of different structures, and figure (a) is the ejector in straight tube-like, and figure (b) is band The ejector of bend pipe；
Fig. 3 is the ejector schematic diagram of two kinds of different structures of the present invention, and figure (a) is the ejector in straight tube-like, schemes (b) For F-F in figure (a) to the schematic diagram in cross section, figure (c) is the ejector of band bend pipe, figure (d) for F-F in figure (c) to The schematic diagram in cross section；
Fig. 4 is the ejector internal flow situation schematic diagram of two kinds of different structures of the present invention.
Description of reference numerals:
1-inlet ductwork, 2-ejector, 21-nozzle, 22-Drainage Section, 23-mixing section, 24-trunnion, 25-diffuser, 26-increase Pressure hole, 3-centrifugal impeller, 4-stator, 5-pump chamber, 6-export pipeline, 7-motor.
Detailed description of the invention
Fig. 3 show the structural representation of a kind of ejector 2 that can improve jet-type centrifugal pump cavitation performance of the present invention, institute State the ejector 2 of jet-type centrifugal pump, including nozzle 21, Drainage Section 22, mixing section 23, trunnion 24, diffuser 25 and increasing Pressure hole 26.
As in figure 2 it is shown, when jet-type centrifugal pump runs at big flow rate working conditions, generation cavitation is caused inside ejector trunnion Pump lift drastically declines, simultaneously induced vibration noise.As shown in Figure 4, when designing pressurized hole at ejector 2 trunnion 24 position After 26, the highly pressurised liquid in pump chamber 5 is introduced trunnion 24 area of low pressure by pressurized hole 26, increases the pressure of trunnion 24 area of low pressure Power, improves the anti-cavitation performance of jet-type centrifugal pump ejector 2.Reach expected design effect.
As it is shown on figure 3, pressurized hole 26 and trunnion 24 wall angle theta are 30 °≤θ≤90 °, it is preferred that the trunnion of ejector 2 24 length L3Time longer, pressurized hole 26 and trunnion 24 wall angle theta are 30 °≤θ≤60 °.Pressurized hole 26 enters to trunnion 24 Mouth distance L0With trunnion 24 length L3Ratio be 1/6～1/2.Pressurized hole 26 diameter D0With trunnion 24 diameter D2Ratio It is 1/20～1/12.Pressurized hole 26 number is 2≤N≤4, and circumferencial direction is uniformly distributed.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Wherein it is used for The pressurized hole improving trunnion area of low pressure flow stream pressure is indispensable part in this programme, but is not limited, only Want described ejector by the highly pressurised liquid introducing trunnion area of low pressure in pump chamber by pressurized hole thus to be played and improve cavitation Can scheme all at the row of protection of the present invention.Although the present invention being described in detail with reference to foregoing embodiments, ability The those of ordinary skill in territory is to be understood that；Technical scheme described in previous embodiment still can be modified by it, or right Wherein portion of techniques feature carries out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this Invent the spirit and scope of each embodiment technical scheme.

Claims (6)

1. the ejector improving jet-type centrifugal pump cavitation performance, it is characterised in that include nozzle (21), Drainage Section (22), Mixing section (23), trunnion (24), diffuser (25) and pressurized hole (26), described pressurized hole (26) is arranged at ejector (2) Trunnion (24) position, described pressurized hole (26) arrive trunnion import distance L0With length of throat L3Ratio be 1/6～1/2, Pressurized hole (26) is θ with the direction of trunnion (24) wall angle, 30 °≤θ≤90 °.
A kind of ejector improving jet-type centrifugal pump cavitation performance the most according to claim 1, it is characterised in that: described The diameter D of pressurized hole (26)0Diameter D with trunnion (24)2Ratio be 1/20～1/12.
A kind of ejector improving jet-type centrifugal pump cavitation performance the most according to claim 1, it is characterised in that: described The number of pressurized hole (26) is that N, 2≤N≤4, and circumferencial direction are uniformly distributed.
A kind of ejector improving jet-type centrifugal pump cavitation performance the most according to claim 1, it is characterised in that: described A diameter of D of nozzle (21)1,
In formula:
Q1For nozzle injection flow, wherein, nozzle injection flow Q1Equal to centrifugal impeller inlet flow rate Q0Deduct pump inlet flow Q2, centrifugal impeller inlet flow rate Q0With pump inlet flow Q2Can draw according to jet-type centrifugal pump design requirement；
μ is solid particle and liquid velocity slip correction factor, and in water medium, its numerical value is 1；
α is ejector trunnion import function, and empirical value takes 1～1.05；
Δp0For the pressure differential of nozzle inlet Yu Drainage Section import department, Drainage Section inlet pressure can be approximately pressure at pump inlet；
γ is the unit weight of liquid.
A kind of ejector improving jet-type centrifugal pump cavitation performance the most according to claim 4, it is characterised in that: described A diameter of D of trunnion (24)2:
Wherein, area ratio R represents the ratio of throat area and nozzle area, and its value is relevant to flow-rate ratio M, flow-rate ratio M table Show centrifugal impeller inlet flow rate Q0With nozzle injection flow Q1Ratio；
The a length of L of cylindrical outlet of nozzle (21)1: L1=(0.3～0.5) D1。
A kind of ejector improving jet-type centrifugal pump cavitation performance the most according to claim 5, it is characterised in that: described The a length of larynx mouth of mixing section (23) away from, larynx mouth is away from L2=(0.5～1) D2, i.e. jet expansion is to the distance of trunnion import；
The a length of L of trunnion (24)3: L3=(1.5～3) D2；
The a length of L of diffuser (25)4: L4=(2～5) D2, wherein, L4Being determined by diffusion angle beta, β takes 5 °～8 °.
CN201610431975.9A 2016-06-15 2016-06-15 A kind of ejector improving jet-type centrifugal pump cavitation performance Active CN105909567B (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106224302A (en) * 2016-09-12 2016-12-14 武汉大学 A kind of jet pump with scroll casing type flume
CN106438512A (en) * 2016-11-08 2017-02-22 四川大学 Ring-symmetry air supplementing device and method for reducing cavitation of liquid jet pump
CN106837822A (en) * 2017-03-31 2017-06-13 武汉武泵泵业制造有限公司 A kind of pulsing jet vavuum pump of horizontal water outlet
CN106837805A (en) * 2017-03-31 2017-06-13 武汉武泵泵业制造有限公司 One kind centrifugation Pulsed Jet Pump
CN107269544A (en) * 2017-08-16 2017-10-20 利欧集团浙江泵业有限公司 A kind of jet pump
CN109967429A (en) * 2019-03-30 2019-07-05 山东大学 One kind being used for the clean integrated device of medical instrument heating disinfection
CN110439866A (en) * 2019-09-07 2019-11-12 浙江日井泵业股份有限公司 A kind of low noise jet pump
CN110469542A (en) * 2019-08-16 2019-11-19 中国航发北京航科发动机控制***科技有限公司 A kind of fuel inlet device improving centrifugal pump suction capacity
CN110685964A (en) * 2019-11-13 2020-01-14 四川大学 Jet pump capable of automatically and uniformly supplementing air and reducing corrosion
CN111075772A (en) * 2019-12-23 2020-04-28 北京中煤矿山工程有限公司 Reverse circulation jet pump for residual drilling fluid in ground pre-grouting flowback stratum
CN114471362A (en) * 2022-01-29 2022-05-13 武汉大学 Jet type super-cavitation generation system and super-cavitation generation method
CN115199594A (en) * 2022-07-14 2022-10-18 兰州理工大学 Jet self-priming pump
CN115387760A (en) * 2021-05-25 2022-11-25 中国石油化工股份有限公司 Jet cyclone device, self-circulation jet cyclone drainage gas production system and method

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SU1204819A1 (en) * 1984-07-16 1986-01-15 Институт ядерной энергетики АН БССР Pumping unit
US6042089A (en) * 1996-07-01 2000-03-28 Klein; Christophe Foam generating device
CN1987123A (en) * 2006-12-27 2007-06-27 武汉大学 Device for improving liquid flow pump cavitation property
CN201045359Y (en) * 2007-05-28 2008-04-09 武汉大学 Fluidic jet pump for reducing vibration and noise
CN102146813A (en) * 2011-03-16 2011-08-10 李树生 Waste steam heating, pressurizing and recycling system
CN205744629U (en) * 2016-06-15 2016-11-30 江苏大学 A kind of ejector improving jet-type centrifugal pump cavitation performance

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SU1204819A1 (en) * 1984-07-16 1986-01-15 Институт ядерной энергетики АН БССР Pumping unit
US6042089A (en) * 1996-07-01 2000-03-28 Klein; Christophe Foam generating device
CN1987123A (en) * 2006-12-27 2007-06-27 武汉大学 Device for improving liquid flow pump cavitation property
CN201045359Y (en) * 2007-05-28 2008-04-09 武汉大学 Fluidic jet pump for reducing vibration and noise
CN102146813A (en) * 2011-03-16 2011-08-10 李树生 Waste steam heating, pressurizing and recycling system
CN205744629U (en) * 2016-06-15 2016-11-30 江苏大学 A kind of ejector improving jet-type centrifugal pump cavitation performance

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106224302A (en) * 2016-09-12 2016-12-14 武汉大学 A kind of jet pump with scroll casing type flume
CN106438512A (en) * 2016-11-08 2017-02-22 四川大学 Ring-symmetry air supplementing device and method for reducing cavitation of liquid jet pump
CN106837822A (en) * 2017-03-31 2017-06-13 武汉武泵泵业制造有限公司 A kind of pulsing jet vavuum pump of horizontal water outlet
CN106837805A (en) * 2017-03-31 2017-06-13 武汉武泵泵业制造有限公司 One kind centrifugation Pulsed Jet Pump
CN107269544A (en) * 2017-08-16 2017-10-20 利欧集团浙江泵业有限公司 A kind of jet pump
CN109967429A (en) * 2019-03-30 2019-07-05 山东大学 One kind being used for the clean integrated device of medical instrument heating disinfection
CN110469542A (en) * 2019-08-16 2019-11-19 中国航发北京航科发动机控制***科技有限公司 A kind of fuel inlet device improving centrifugal pump suction capacity
CN110439866A (en) * 2019-09-07 2019-11-12 浙江日井泵业股份有限公司 A kind of low noise jet pump
CN110685964A (en) * 2019-11-13 2020-01-14 四川大学 Jet pump capable of automatically and uniformly supplementing air and reducing corrosion
CN111075772A (en) * 2019-12-23 2020-04-28 北京中煤矿山工程有限公司 Reverse circulation jet pump for residual drilling fluid in ground pre-grouting flowback stratum
CN111075772B (en) * 2019-12-23 2022-02-11 北京中煤矿山工程有限公司 Reverse circulation jet pump for residual drilling fluid in ground pre-grouting flowback stratum
CN115387760A (en) * 2021-05-25 2022-11-25 中国石油化工股份有限公司 Jet cyclone device, self-circulation jet cyclone drainage gas production system and method
CN115387760B (en) * 2021-05-25 2024-05-17 中国石油化工股份有限公司 Jet swirling device, self-circulation jet swirling drainage gas production system and method
CN114471362A (en) * 2022-01-29 2022-05-13 武汉大学 Jet type super-cavitation generation system and super-cavitation generation method
CN114471362B (en) * 2022-01-29 2023-01-10 武汉大学 Jet type supercavitation generation system and supercavitation generation method
CN115199594A (en) * 2022-07-14 2022-10-18 兰州理工大学 Jet self-priming pump

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