CN106640769B - A kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump - Google Patents

A kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump Download PDF

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Publication number
CN106640769B
CN106640769B CN201611090536.2A CN201611090536A CN106640769B CN 106640769 B CN106640769 B CN 106640769B CN 201611090536 A CN201611090536 A CN 201611090536A CN 106640769 B CN106640769 B CN 106640769B
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outer tube
axial
inner sleeve
flow pump
outlet
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CN106640769A (en
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张睿
徐辉
陈毓陵
冯建刚
周春天
王晓升
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Hohai University HHU
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Hohai University HHU
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/52Casings; Connections of working fluid for axial pumps
    • F04D29/528Casings; Connections of working fluid for axial pumps especially adapted for liquid pumps

Abstract

The invention discloses a kind of taper water feed apparatus for improving the unstable hydraulic characteristic(s) of axial-flow pump, the both ends of outer tube are respectively inlet end and an outlet end, outlet end outer wall is provided with outlet(discharge) flange, the outlet end of outer tube is connect with the input end of axial-flow pump impeller room by outlet(discharge) flange, the input end outer wall of outer tube is provided with suction flange, and the input end of outer tube can be connect with water inlet line by suction flange;It is provided with inner sleeve in outer tube, there is gap between inside and outside casing, be provided with gusset in the gap, inside and outside casing is fixedly connected by the gusset, the whirlpool plate that disappears is provided on inner sleeve inside pipe wall.The present invention substantially improves the influent stream condition under low flow rate condition before impeller, completely eliminates that axial-flow pump waterpower is unstable " saddle area ", has effectively widened the safe and stable operation condition range of axial-flow pump.Structure of the invention is simple and easy processing makes, and is suitable for any kind of axial-flow pump.

Description

A kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump
Technical field
The invention belongs to water pump technologies, and in particular to a kind of taper water inlet for improving the unstable hydraulic characteristic(s) of axial-flow pump Device.
Background technique
Axial-flow pump has the characteristics that flow is big, lift is low, be widely used in distruting water transregionally, agricultural irrigation and municipal administration to The fields such as draining.Under design conditions, axial-flow pump flow condition is good, internal flow is stablized, and the hydraulic efficiency pumped at this time is higher And it is stable.But under off-design behaviour when especially low flow rate condition, the change of impeller inlet inflow angle is not only drawn It rises and generates flow separation at vacuum side of blade inlet side, also cause the increase of blade upper and lower surface pressure difference and clearance leakage of blade tip stream is promoted to increase By force.Flow direction and the main flow direction of vacuum side of blade separation stream and impeller blade-tip leakage flow by impeller on the contrary, simultaneously because revolved The influence transferred to is so that above-mentioned flowing has biggish circumferential speed, thus clogging impeller inlet channel, deterioration water pump influent stream Condition causes the hydraulic loss increase of pump, pump performance sharply to decline, promotes the formation of waterpower unstable " saddle area ", seriously Influence the safe and stable operation of axial-flow pump.
Summary of the invention
The purpose of the present invention is the deficiencies for the existing taper water feed apparatus for improving the unstable hydraulic characteristic(s) of axial-flow pump, mention Out it is a kind of improve the unstable hydraulic characteristic(s) of axial-flow pump taper water feed apparatus, will not to design discharge and big flow operating condition under pump Hydraulic performance produce bigger effect in the case where, can sufficiently improve the water inlet item under low flow rate condition before axial-flow pump impeller import Part completely eliminates the generation of axial-flow pump unstable " saddle area ", effectively widens the stable operating condition section of axial-flow pump.
To achieve the purpose of the present invention, it adopts the following technical scheme that
A kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump, including outer tube, the both ends point of outer tube Not Wei inlet end and an outlet end, outlet end outer wall is provided with outlet(discharge) flange, and the outlet(discharge) flange is uniformly distributed along the circumference 4~12 spiral shells The outlet end in hole, outer tube is connect with the input end of axial-flow pump impeller room by outlet(discharge) flange, and the diameter D of outer tube outlet end Equal to the input end diameter of axial-flow pump impeller room;
The input end outer wall of outer tube is provided with suction flange, and the suction flange is uniformly distributed along the circumference 4~12 screw holes, outside The input end of casing can be connect with water inlet line by suction flange;
It is provided with inner sleeve in outer tube, there is gap between inner sleeve and outer tube, be provided with gusset in the gap, lead to It crosses the gusset and is fixedly connected with inner sleeve with outer tube, the whirlpool plate that disappears is provided on inner sleeve inside pipe wall.
Inner sleeve outside wall surface described above and outer sleeve inner wall face are connected by 4 ~ 6 gussets evenly distributed in the circumferential direction It connects;6 ~ 18 whirlpool plates that disappear evenly distributed in the circumferential direction on the inner wall of the inner sleeve;The import and export side of the gusset carries out Rounding processing is to reduce water impact loss.
Outer tube of the present invention, inner sleeve, gusset and disappear the structure of whirlpool plate and position dimension goes out to outer tube Relative value on the basis of mouth diameter D indicates, these relative values can be obtained multiplied by outer tube outlet diameter D using of the invention Actual size.
Preferably, the import of the outlet of the outer tube and axial-flow pump impeller room is by flanged joint, and outer tube goes out Mouth diameter D is equal to the inlet diameter of axial-flow pump impeller room;The cone angle of the outer tube is 5 ~ 60 °, and inlet diameter is 1.05 ~ 5D, Height is 0.05 ~ 3D;The import of the outer tube can be open, can also pass through flanged joint with water inlet line.
As a preferred technical solution of the present invention, the outer tube is the taper with identical taper with inner sleeve Structure, input end diameter are big compared with outlet end.
Further, the inner sleeve with a thickness of 0.001 ~ 0.01D, inner sleeve and housing tube spacing be 0.005 ~ 0.1D。
Further, the input end of the inner sleeve and the input end of outer tube are concordant, and the outlet end of inner sleeve is higher than outer The outlet end of casing, after outer tube is connect with axial-flow pump impeller room, the outlet end of inner sleeve is at impeller leaf top;The inner sleeve The import and export end of pipe is rounding design.
Further, disappear whirlpool plate circumference uniform distribution on the inner wall of inner sleeve, the cross section for the whirlpool plate that disappears is sector structure, circle The angle of two sides is 5 ~ 20 ° in circumferential direction;The length of said vortex reducing plate is equal with the bus length of inner sleeve inside pipe wall, and disappear whirlpool plate With a thickness of 0.01 ~ 0.2D.
Preferably, the width of the gusset is 0.001 ~ 0.005D;The length of the gusset and the bus of outer sleeve inner wall Equal length.
Gold can be used in the above outer tube, suction flange, outlet(discharge) flange, inner sleeve, gusset and the whirlpool plate that disappears of the invention Belong to material, plastic material or pmma material processing and fabricating.
The present invention is based on fluid dynamic theory and axial-flow pump design theory, by axial-flow pump under low flow rate condition On the basis of the test measurements of portion's Complex Flows, numerical simulation analysis, a kind of simple, the scientific and reasonable water inlet of the structure proposed Device.
The beneficial effects of the present invention are:
Tip leakage flow at blade and blade top and the mainstream at impeller center can be separated by the inner sleeve in the present invention, Prevent clearance leakage of blade tip stream from influencing on the obstruction of mainstream, while gusset can also reduce clearance leakage of blade tip stream circumferential speed and cause Hydraulic loss;The uniformly distributed whirlpool plate that disappears can play the role of rotating in a circumferential direction flowing before weakening impeller inlet on inner sleeve inside pipe wall. Therefore, the present invention substantially improves the influent stream condition under low flow rate condition before impeller, and it is unstable to completely eliminate axial-flow pump waterpower " saddle area " has effectively widened the safe and stable operation condition range of axial-flow pump.Structure of the invention is simple and easy processing makes, Suitable for any kind of axial-flow pump.
Detailed description of the invention
Fig. 1 is structural profile illustration of the invention;
Fig. 2 is structure top view of the invention;
Fig. 3 is cross-section structure scale diagrams of the invention;
Fig. 4 is planar structure scale diagrams of the invention;
Fig. 5 is the assembling schematic diagram of the embodiment of the present invention;
Fig. 6 is the axial-flow pump hydraulic performance comparison diagram using present invention front and back.
Specific embodiment
The present invention is described in detail with embodiment with reference to the accompanying drawing.
As shown, the present invention relates to outer tube 1, suction flange 2, outlet(discharge) flange 3, inner sleeve 4, gusset 5, the whirlpool plate 6 that disappears, The technical characteristics such as impeller 7, blade wheel chamber 8, blade wheel chamber's suction flange 9, wheel hub 10, pump shaft 11.
As depicted in figs. 1 and 2, a kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump, including outer tube 1, the both ends of outer tube 1 are respectively inlet end and an outlet end, and outlet end outer wall is provided with outlet(discharge) flange 3, the outlet end of outer tube 1 It is connect with the input end of axial-flow pump impeller room by outlet(discharge) flange 3, and the diameter D of 1 outlet end of outer tube is equal to axial-flow pump impeller The input end diameter of room;
The input end outer wall of outer tube 1 is provided with suction flange 2, and the input end of outer tube 1 can pass through with water inlet line Suction flange 2 connects;
It is provided with inner sleeve 4 in outer tube 1, there is gap between inner sleeve 4 and outer tube 1, be provided with muscle in the gap Inner sleeve 4 is fixedly connected with outer tube 1 by gusset 5, is provided with the whirlpool plate 6 that disappears on 4 inner wall of inner sleeve by plate 5.
Metal material, modeling can be used in outer tube 1, suction flange 2, outlet(discharge) flange 3, inner sleeve 4, gusset 5 and the whirlpool plate 6 that disappears Expect material or pmma material processing and fabricating.
Outer tube 1, inner sleeve 4, gusset 5 and the whirlpool plate 6 that disappears structure and position dimension to 1 outlet diameter of outer tube Relative value on the basis of D indicates, these relative values can be obtained multiplied by 1 outlet diameter D of outer tube using reality of the invention Size.
As shown in Figure 3 and Figure 4, outer tube 1 is the pyramidal structure with identical taper, input end diameter with inner sleeve 4 It is big compared with outlet end.The cone angle of outer tube 1αIt is 1.05 ~ 5D for 5 ~ 60 °, inlet diameter D1, heightHFor 0.05 ~ 3D;Outer tube Import open can use, and can also pass through flanged joint with water inlet line;Suction flange 2 is uniformly distributed along the circumference 4~12 screw holes, outlet Flange 3 is uniformly distributed along the circumference 4~12 screw holes;It is parallel that inner sleeve 4 is located at the inside of outer tube 1 and the surface of the two, is formed Gap vertical range T1 be 0.005 ~ 0.1D;The inlet side of inner sleeve 4 and the inlet side flush of outer tube 1;Inner sleeve 4 It exports when being higher than the outlet of outer tube 1;The import and export side of inner sleeve 4 carries out rounding to reduce water impact loss;Inner sleeve The thickness T3 of pipe 4 is 0.001 ~ 0.01D;The inner wall of the outer wall of inner sleeve 4 and outer tube 1 pass through be evenly arranged in the circumferential direction 4 ~ 6 gussets 5 connect;The import and export side of gusset 5 carries out rounding processing to reduce water impact loss;The width T2 of gusset 5 is 0.001~0.005D;The length of gusset is equal with the inner wall bus length of outer tube, is L1;On the inner wall of inner sleeve 4 circumferentially Direction is evenly arranged 6 ~ 18 whirlpool plates 6 that disappear;Disappear the corresponding angle of whirlpool plate 6 in a circumferential directionθIt is 5 ~ 20 °;Disappear the length of whirlpool plate It is equal with the bus length of inner sleeve inside pipe wall, it is L2, the thickness T4 for the whirlpool plate that disappears is 0.01 ~ 0.2D.
Embodiment 1
As shown in Figure 5, wherein outer tube 1 is connect through outlet(discharge) flange 3 with blade wheel chamber suction flange 9, outer tube inlet diameter D is equal to the inlet diameter 290mm of blade wheel chamber 8, and the cone angle of outer tube 1 is 15 °, is highly 230mm, inlet diameter 350mm, outside Casing suction flange is connect with water inlet line, and inner sleeve 4 and 1 spacing of outer tube are 5mm and pass through 4 circumferentially uniformly distributed gussets 5 Connection, for inner sleeve 4 with a thickness of 1.2mm, 5 width of gusset is 2mm, is evenly distributed 12 whirlpool plates 6 that disappear on inner sleeve inside pipe wall, disappear whirlpool The corresponding angle of plate 6 in a circumferential direction is 10 °, with a thickness of 10mm, and the inlet side distance of inner sleeve and impeller blade is 8mm.
As shown in fig. 6, comparative analysis is using the axial-flow pump device before and after the present invention using Three Dimensional Flow Simulation method Hydraulic performance curve is can be found that: taper water feed apparatus of the invention can eliminate " horse unstable in axial-flow pump hydraulic performance Saddle area " thereby may be ensured that axial-flow pump stable operation under full flow operating condition, effectively widen the safe and stable operation work of axial-flow pump Condition section.

Claims (7)

1. a kind of taper water feed apparatus for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: including outer tube (1), housing The both ends for managing (1) are respectively inlet end and an outlet end, and outlet end outer wall is provided with outlet(discharge) flange (3), the outlet end of outer tube (1) It is connect with the input end of axial-flow pump impeller room by outlet(discharge) flange (3), and the diameter D of outer tube (1) outlet end is equal to axial-flow pump The input end diameter of blade wheel chamber;The input end outer wall of outer tube (1) is provided with suction flange (2), the input end energy of outer tube (1) It is enough to be connect with water inlet line by suction flange (2);
Outer tube (1) is the pyramidal structure with identical taper with inner sleeve (4), and input end diameter is big compared with outlet end;
It is provided with inner sleeve (4) in outer tube (1), there is gap between inner sleeve (4) and outer tube (1), be arranged in the gap There are gusset (5), is fixedly connected with inner sleeve (4) with outer tube (1) by gusset (5), the input end of the inner sleeve (4) and outer The input end of casing (1) is concordant, and the outlet end of inner sleeve (4) is higher than the outlet end of outer tube (1), outer tube (1) and axial-flow pump After blade wheel chamber's connection, the outlet end of inner sleeve (4) is at impeller leaf top;Disappear whirlpool plate (6) are provided on inner sleeve (4) inner wall, Whirlpool plate (6) circumference uniform distribution disappear on the inner wall of inner sleeve (4), the cross section of the whirlpool plate (6) that disappears is sector structure, two on circumferencial direction The angle of side is 5 ~ 20 °;The length of said vortex reducing plate (6) is equal with the bus length of inner sleeve inside pipe wall, the thickness for whirlpool plate (6) that disappear Degree is 0.01 D ~ 0.2D.
2. the taper water feed apparatus according to claim 1 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: housing The cone angle for managing (1) is 5 ~ 60 °, is highly 0.05 D ~ 3D, and the diameter of outer tube (1) input end is 1.05 D ~ 5D.
3. the taper water feed apparatus according to claim 2 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: described Inner sleeve (4) is 0.005 D ~ 0.1D with a thickness of 0.001 D ~ 0.01D, inner sleeve (4) and outer tube (1) spacing.
4. the taper water feed apparatus according to claim 1 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: described The import and export end of inner sleeve (4) is rounding design.
5. the taper water feed apparatus according to claim 1 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: described Suction flange (2) is uniformly distributed along the circumference 4~12 screw holes.
6. the taper water feed apparatus according to claim 1 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: described Outlet(discharge) flange (3) is uniformly distributed along the circumference 4~12 screw holes.
7. the taper water feed apparatus according to claim 1 for improving the unstable hydraulic characteristic(s) of axial-flow pump, it is characterized in that: described The width of gusset (5) is 0.001 D ~ 0.005D, and the length of gusset (5) is equal with the bus length of outer tube (1) inner wall.
CN201611090536.2A 2016-12-01 2016-12-01 A kind of taper water feed apparatus improving the unstable hydraulic characteristic(s) of axial-flow pump Active CN106640769B (en)

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CN111079367B (en) * 2019-11-28 2022-02-01 河海大学 Axial flow pump spoke optimization design method suitable for different water inlet taper pipes
CN112177831B (en) * 2020-10-28 2022-03-22 西安理工大学 Bidirectional through-flow turbine with runner chamber in sawtooth structure

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CN102678630B (en) * 2012-05-29 2015-04-22 蓝深集团股份有限公司 An inlet device capable of suppressing a saddle-shaped curve of pumping head of an axial flow pump
CN203146426U (en) * 2013-02-05 2013-08-21 扬州大学 Novel axial flow pump
CN105697421A (en) * 2016-03-23 2016-06-22 江苏大学 Saddle-area-free axial flow fan
CN105782121A (en) * 2016-04-07 2016-07-20 扬州大学 Axial flow pump
KR101646200B1 (en) * 2016-05-09 2016-08-05 동해엔지니어링주식회사 Apparatus for suction vane of axial and mixed flow pump
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