CN104776031A - Multiple-stage centrifugal pump provided with induction wheel - Google Patents

Multiple-stage centrifugal pump provided with induction wheel Download PDF

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Publication number
CN104776031A
CN104776031A CN201510075388.6A CN201510075388A CN104776031A CN 104776031 A CN104776031 A CN 104776031A CN 201510075388 A CN201510075388 A CN 201510075388A CN 104776031 A CN104776031 A CN 104776031A
Authority
CN
China
Prior art keywords
pump
inducer
multistage
bearing
primarily
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510075388.6A
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Chinese (zh)
Inventor
蒋俊美
蒋俊波
蒋阿生
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Liyang Chaoqiang Chains Manufacture Co Ltd
Original Assignee
Liyang Chaoqiang Chains Manufacture Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Liyang Chaoqiang Chains Manufacture Co Ltd filed Critical Liyang Chaoqiang Chains Manufacture Co Ltd
Priority to CN201510075388.6A priority Critical patent/CN104776031A/en
Publication of CN104776031A publication Critical patent/CN104776031A/en
Pending legal-status Critical Current

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Abstract

The cavitation process in a water pump is the process that a flow passage component is damaged by the breakage of bubbles generated in the water pump. After the water pump is subjected to cavitation, the flow passage component is damaged, noise and vibration are generated, the performances of the pump are reduced, and the pump cannot normally work since the liquid in the pump is interrupted in a serious case. In order to solve the problems, the invention adopts the technical scheme that an induction wheel is additionally arranged in front of a first stage impeller of a multiple-stage centrifugal pump.

Description

With the multistage centrifugal pump of inducer
Technical field
The present invention relates to fluid machinery, specifically relate to a kind of centrifugal pump with inducer.
Background technique
At a certain temperature, when reducing pressure to pressure for vaporization at this temperature, liquid just produces steam bubble to liquid.The phenomenon of this generation bubble is called cavitation.The bubble produced during cavitation, when flowing to high pressure place, its volume reduces so that vanishes.Thisly be called that cavitation crumbles and fall due to pressure increase bubble collapse phenomenon in a liquid.
Pump is on-stream, if the regional area of its overcurrent part (normally impeller blade import somewhere after a while) is because certain reason, when the absolute pressure of pumping liquid reduces the vaporizing liquid pressure at temperature at that time, liquid just starts vaporization at this place, produce a large amount of steam, form bubble, when the zone of high pressure of the liquid containing a large amount of bubble forward in impeller, the highly pressurised liquid around bubble causes bubble to reduce sharp down to breaking.While bubble condensation is broken, liquid particle is with very high speed filling hole, very strong water hammer is produced instantaneously at this, and hit metal surface with very high frequency of impact, impact stress can reach hundreds of to several thousand barometric pressure, frequency of impact can reach several ten thousand times per second, wall thickness can be punctured time serious.
In water pump, produce process that bubble and bubbles burst make flow passage components be subjected to destroy is exactly cavitation process in water pump.Except producing except destruction flow passage components after water pump generation cavitation, also can produce noise and vibration, and cause pump performance to decline, liquid in pump can be made time serious to interrupt, cisco unity malfunction.
Summary of the invention
Invent technical problem to be solved to be, improve the anti-cavitation performance of multistage centrifugal pump.
In order to solve the problem, the technical solution adopted in the present invention is: before first stage impeller, install inducer additional.
Inducer is an axial-flow blower, and it is directly contained in the upstream of multistage pump first order impeller, and with its synchronous axial system.Inducer is the quiet positive suction pressure reducing multistage pump, and this is that the static pressure leaning on inducer to increase multistage pump first order impeller eye realizes.The eddy flow taking turns to outflow through induction also one plays a effect to the net positive suction head reducing multistage pump.Multistage pump inducer is that a blade loads is very low, and blade angle is little, and the number of blade is few, the aial flow impeller that cascade solidity is large.It has high suction performance.The lift utilizing inducer to produce plays pressurization to centrifugal impeller below, improves the suction performance of multistage pump, makes the suction specific speed of multistage pump reach about 3000.In order to avoid when inducer works in over power district, steam bubble on blade pressure surface makes cross section of fluid channel cause obstruction--cavitation phenomenons, therefore when multistage pump works, inducer is always in sub load working area and runs, and gives multi-level pump impeller with the supercharging of necessity.
When designing pump inducer, can take some measures. improve its anti-cavitation performance.Usual inducer carries out designing as the aial flow impeller of light load, selects larger Ji to walk slowly like a woman density, the less angle of attack, larger import area of passage, maximum blade thickness from the Changing Pattern etc. away from import.To make the pressure uniform streaming inducer liquid stream, and there is minimum pressure from the place away from import.
Number of blade Z=5, wheel hub and wheel rim profile are cylindrical or 15 ° of tapers, and we often make the design discharge of inducer and 1.5--2.3 times of multistage pump rated flow.
Thus, when same traffic and lift, greatly can reduce impeller outer diameter or reduce progression.
Embodiment
Multistage centrifugal pump with inducer is primarily of the most of composition of motor, stator, rotor, bearing and shaft seal four, and multistage pump stationary part, primarily of compositions such as suction casing, stage casing, Spit Section and stators, has turnbuckle by each section of clamping, forms working room.Level sucks, and spues vertically upward; Multi-stage pump rotor part is primarily of compositions such as axle, impeller, Balance disc and axle sleeves.Axial force is balanced by Balance disc.Multistage pump bearing primarily of compositions such as bearing support, bearing and bearing glands, bearing grease or thin oil lubricant.Multistage pump shaft seal adopts soft packing seal, and primarily of the composition such as sealed letter body, filler, water retaining ring on inlet segment and tail-hood, water seal water derives from the press water in pump, and multistage pump rotates pump by elastic coupling flexible coupling by prime mover Direct driver.Pump viewed from prime mover end, pump is that clockwise direction rotates, and is horizontal single-suction multilevel segmental centrifugal pump.For conveying clear water.D type transport pump medium temperature is less than 80 DEG C.
Before inducer is arranged at first stage impeller, inducer carries out designing as the aial flow impeller of light load, make the pressure uniform streaming inducer liquid stream, and there is minimum pressure from the place away from import, the number of blade Z=5 of inducer, wheel hub and wheel rim profile are cylindrical or 15 ° of tapers, we often make the design discharge of inducer and 1.5--2.3 times of multistage pump rated flow.

Claims (4)

1. the multistage centrifugal pump with inducer, primarily of the most of composition of motor, stator, rotor, bearing and shaft seal four, it is characterized in that: multistage pump stationary part is primarily of compositions such as suction casing, stage casing, Spit Section and stators, there is turnbuckle by each section of clamping, form working room, level sucks, and spues vertically upward.
2. the multistage centrifugal pump of band inducer as claimed in claim 1, multi-stage pump rotor part is primarily of axle, impeller, the composition such as Balance disc and axle sleeve, axial force is balanced by Balance disc, multistage pump bearing is primarily of bearing support, the composition such as bearing and bearing gland, bearing grease or thin oil lubricant, multistage pump shaft seal adopts soft packing seal, primarily of the sealed letter body on inlet segment and tail-hood, filler, the compositions such as water retaining ring, water seal water derives from the press water in pump, multistage pump rotates pump by elastic coupling flexible coupling by prime mover Direct driver, pump viewed from prime mover end, pump is that clockwise direction rotates, it is horizontal single-suction multilevel segmental centrifugal pump, before inducer is arranged at first stage impeller, inducer carries out designing as the aial flow impeller of light load, make the pressure uniform streaming inducer liquid stream, and there is minimum pressure from the place away from import, the number of blade Z=5 of inducer.
3. the multistage centrifugal pump of band inducer as claimed in claim 1, it is characterized in that, wheel hub and wheel rim profile are cylindrical or 15 ° of tapers.
4. the multistage centrifugal pump of band inducer as claimed in claim 1, is characterized in that, for conveying clear water, D type transport pump medium temperature is less than 80 DEG C.
CN201510075388.6A 2015-02-12 2015-02-12 Multiple-stage centrifugal pump provided with induction wheel Pending CN104776031A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510075388.6A CN104776031A (en) 2015-02-12 2015-02-12 Multiple-stage centrifugal pump provided with induction wheel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510075388.6A CN104776031A (en) 2015-02-12 2015-02-12 Multiple-stage centrifugal pump provided with induction wheel

Publications (1)

Publication Number Publication Date
CN104776031A true CN104776031A (en) 2015-07-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510075388.6A Pending CN104776031A (en) 2015-02-12 2015-02-12 Multiple-stage centrifugal pump provided with induction wheel

Country Status (1)

Country Link
CN (1) CN104776031A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109538491A (en) * 2018-10-30 2019-03-29 浙江水利水电学院 A kind of centrifugal multistage pump multiple centrifugal pump and its installation method with inducer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH555005A (en) * 1972-06-23 1974-10-15 Weinheimer Gummiwerke Gmbh AGGREGATE FOR SUCTION AND DELIVERY OF LIQUIDS.
CN203926141U (en) * 2014-05-29 2014-11-05 长沙佳能通用泵业有限公司 The self-balance type multistage centrifugal pump of a kind of end water sucting belt inducer
CN203926033U (en) * 2014-05-29 2014-11-05 长沙佳能通用泵业有限公司 The horizontal multi-stage centrifugal pump of a kind of end water sucting belt inducer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH555005A (en) * 1972-06-23 1974-10-15 Weinheimer Gummiwerke Gmbh AGGREGATE FOR SUCTION AND DELIVERY OF LIQUIDS.
CN203926141U (en) * 2014-05-29 2014-11-05 长沙佳能通用泵业有限公司 The self-balance type multistage centrifugal pump of a kind of end water sucting belt inducer
CN203926033U (en) * 2014-05-29 2014-11-05 长沙佳能通用泵业有限公司 The horizontal multi-stage centrifugal pump of a kind of end water sucting belt inducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109538491A (en) * 2018-10-30 2019-03-29 浙江水利水电学院 A kind of centrifugal multistage pump multiple centrifugal pump and its installation method with inducer
CN109538491B (en) * 2018-10-30 2021-01-12 浙江水利水电学院 Multistage centrifugal pump with inducer and installation method thereof

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Application publication date: 20150715