CN107806439A - The axial force balance structure of centrifugal water pump - Google Patents
The axial force balance structure of centrifugal water pump Download PDFInfo
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- CN107806439A CN107806439A CN201610817516.4A CN201610817516A CN107806439A CN 107806439 A CN107806439 A CN 107806439A CN 201610817516 A CN201610817516 A CN 201610817516A CN 107806439 A CN107806439 A CN 107806439A
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- axial force
- hole
- force balance
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 230000008676 import Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 description 27
- 239000000463 material Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 230000009466 transformation Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 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
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/106—Shaft sealings especially adapted for liquid pumps
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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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of axial force balance structure of centrifugal water pump, the axial force balance structure includes the pump housing, impeller, pump shaft and pump cover；Pump body is provided with low-pressure area, higher-pressure region and secondary nip；When centrifugal water pump works, fluid media (medium) enters low-pressure area from import, and after impeller acting boosting, segment fluid flow medium enters higher-pressure region, and segment fluid flow medium enters time nip；Wherein, secondary nip between impeller, pump shaft and pump cover by defining；Also, pump shaft is provided with pump shaft axis hole at the axle center of impeller end, and is additionally provided with pump shaft through hole；Pump shaft through hole and pump shaft axis hole are to be in fluid communication；The opening of pump shaft through hole connects with time nip, and the opening of pump shaft axis hole connects with low-pressure area, so that the fluid media (medium) of secondary nip flows into low-pressure area by pump shaft through hole and pump shaft axis hole.The axial force balance structure of the present invention can improve the hydraulic efficiency and axle pump intensity of centrifugal pump, cost-effective.
Description
Technical field
The present invention relates to mechanical field, relates more specifically to a kind of axial force balance structure of centrifugal water pump.
Background technology
In existing centrifugal pump device, water pump pumped (conveying) medium is flowed back to after impeller does work by the balance pipe on impeller
Low-pressure area at impeller inlet, the pressure of impeller both sides is offset with this, reach balancing axial thrust purpose.But existing structure exists following
Defect：
1st, hydraulic efficiency is influenceed.Water pump pumped (conveying) medium is directly back to entering for impeller by balance pipe after impeller does work
Mouthful, the rotated flowing liquid at inlet channel is impacted, a fluid stream in impeller channel is caused disorder, influences the operation effect of water pump
Rate.
2nd, part quality hidden danger.Impeller intra vane is not only easily damaged when boring balance pipe at cover plate after the impeller, also to leaf
The structural strength of wheel impacts.
3rd, part working process problem.Bore balance pipe on impeller, burr caused by drilling be attached to impeller internal, it is necessary to
Reject in time, influence production efficiency.
Therefore this area is easy to process, together there is an urgent need to develop the new intensity for effectively improving hydraulic efficiency, improving pump shaft
When cost-effective technology again.
The content of the invention
The purpose of the present invention is exactly that the structure by balance pipe balancing axial thrust of centrifugal water pump is improved, and is banned
The measure of balance pipe is opened up on impeller, using the structure that pump shaft axis hole and pump shaft through hole are opened up on pump shaft, makes the stream of time nip
Body medium flows into the low-pressure area of centrifugal water pump import by pump shaft through hole and pump shaft axis hole so that in impeller channel medium not by
Impact, ensure centrifugal water pump operational efficiency, and ensure impeller cover structural intergrity and intensity；The intensity of pump shaft is improved, is also subtracted
Lack the weight of pump shaft, save material cost.
The invention provides a kind of axial force balance structure of centrifugal water pump, the axial force balance structure include the pump housing 1,
Impeller 2, pump shaft 4 and pump cover 6；
The pump body is provided with low-pressure area, higher-pressure region and secondary nip；When the centrifugal water pump works, fluid media (medium) from
Import enters low-pressure area, and after the acting boosting of impeller 2, segment fluid flow medium enters the higher-pressure region, and segment fluid flow medium enters
The secondary nip；Wherein, described secondary nip between the impeller 2, the pump shaft 4 and the pump cover 6 by defining；
Also, the pump shaft 4 is provided with pump shaft axis hole 3 at the axle center of impeller end, and is additionally provided with pump shaft through hole 7；It is described
Pump shaft through hole 7 and the pump shaft axis hole 3 are to be in fluid communication；The opening of the pump shaft through hole 7 connects with the secondary nip, and institute
The opening for stating pump shaft axis hole 3 connects with the low-pressure area, so that the fluid media (medium) of the secondary nip passes through the He of pump shaft through hole 7
Pump shaft axis hole 3 flows into described low-pressure area.
The axial force balance structure of the centrifugal water pump is additionally provided with the mechanical sealing member 5 for sealing pump shaft 4.
The quantity of the pump shaft through hole 7 is 1-4.
In another preference, the quantity of the pump shaft through hole 7 is 2, and the pump shaft through hole 7 crosses axle center, and symmetrical point
Cloth.
The gross area of the pump shaft through hole 7 is ∑ St, the area of the pump shaft axis hole 3 is S0, the ratio between the two ∑ St/S0For
0.7-1.5, preferably 0.8-1.2, more preferably 0.9-1.1.
When necessary electromotor power is 11kW~160kW, the diameter D of the pump shaft 4 is 35mm~70mm.
When necessary electromotor power is 11kW~160kW, the hollow parts diameter d of the pump shaft 4 is 12mm~30mm.
The diameter of axle D of the hollow parts diameter d and the pump shaft 4 ratio d/D be 0.05~0.75, preferably 0.2~
0.6, more preferably 0.3~0.5.
The impeller 2 opens up balance pipe.
The axial force balance structure of the centrifugal water pump is applied to multi-stage centrifugal pump, preferably suitable for one-stage centrifugal water
Pump, more preferably suitable for one step single sucking formula centrifugal water pump.
It should be understood that within the scope of the present invention, above-mentioned each technical characteristic of the invention and have in below (eg embodiment)
It can be combined with each other between each technical characteristic of body description, so as to form new or preferable technical scheme.As space is limited, exist
This no longer tires out one by one states.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to do and simply introduce, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the vertical section structural map of the axial force balance structure in an example of the invention；
Fig. 2 is the axial force balance structure vertical section structural map of the comparative example of an example of the invention；
Fig. 3 is the parameter control curve of the present invention.
In each accompanying drawing, each sign is as follows：
0- imports；
The 1- pump housings；
2- impellers；
3- pump shaft axis holes；
4- pump shafts；
5- mechanical sealing members；
6- pump covers；
7- pump shaft through holes；
13- balance pipes；
A- higher-pressure regions；
B- nip；
C- low-pressure areas.
Embodiment
The present inventor, by largely screening, develops a kind of axle of centrifugal water pump first by in-depth study extensively
To dynamic balance structure.The axial force balance structure of the centrifugal water pump improves the operational efficiency of centrifugal water pump, and ensure that impeller
The integrality of covering plate structure, while the intensity of pump shaft is improved, the weight of pump shaft is decreased, saves material cost.It is basic herein
On complete the present invention.
Term
As used herein, term " hydraulic efficiency " refers to the liquid power for removing hydraulic loss and the liquid without hydraulic loss
Body power ratio.
The axial force balance structure of centrifugal water pump
The invention provides a kind of axial force balance structure of centrifugal water pump, and it is a kind of centrifugal water with specific structure
The axial force balance structure of pump.
Typically, compared with the axial force balance structure of original centrifugal water pump, the present invention by the pump shaft of centrifugal water pump by
Pump shaft axis hole is provided with the axle center of nearly impeller end, and pump shaft through hole is opened up in the radial direction in pump shaft.The pump shaft through hole
Axle center is crossed, and it is symmetrical, the pump shaft through hole is in fluid communication with the pump shaft axis hole, and the pump shaft through hole is located at the pump shaft
The one end of axis hole away from impeller farther out, the opening of pump shaft through hole connect with the secondary nip of centrifugal water pump, the opening of the pump shaft through hole
Positioned at the secondary nip and pump shaft contact-segment of centrifugal water pump, and close to one end of impeller.The opening of pump shaft axis hole connects with low-pressure area,
The working media of centrifugal water pump flows into low-pressure area from secondary nip by above-mentioned pump shaft axis hole and pump shaft through hole, and such design is basic
Liquid stream at vane inlet is not impacted, ensure that the operational efficiency of water pump.
In another preference, the axial force balance structure of the centrifugal water pump eliminates former axial force balance structure impeller
On open up the design of balance pipe, avoid damaging impeller intra vane, while add the structural strength of impeller, if boring on impeller flat
Weighing apparatus hole, burr caused by drilling are attached to impeller internal, influence production efficiency, it is necessary to reject burr in time, answer production technology
Hydridization simultaneously adds production cost.
In another preference, centrifugal water pump can retain the design that balance pipe is opened up on impeller, aid in the pump shaft of the present invention
Axis hole and pump shaft through hole balancing axial thrust.
In another preference, centrifugal water pump can retain the design that balance pipe is opened up on impeller, but compare former centrifugal water pump
Balance pipe improve to some extent, the aperture of existing balance pipe can be relatively smaller, and the position of balance pipe can more press close to leaf
Wheel center, reduce the influence to entrance liquid stream.
In the present invention, it is not particularly limited for pump shaft material, pump shaft size and pump power etc..
For material, the conventional pump shaft material in this area, such as stainless steel, alloy material etc. can be used.
For the size of pump shaft, the representational a diameter of 5~200mm of pump shaft, preferably 10~150mm, more preferably 20
~100mm.
For the length of pump shaft, representational pump shaft length is 50~3000mm, preferably 90~2500mm, more preferably
150~2000mm.
For pump power, representational pump power is 1~500kW, preferably 5~250kW, more preferably 10~200kW.
Generally, those skilled in the art can determine as needed suitable pump power, pump shaft material, pump shaft diameter,
The parameters such as pump shaft length.
In the present invention, pump shaft axis hole and pump shaft through hole can be formed with conventional method.A kind of method be initially formed it is solid
Pump shaft, then processing form above-mentioned pump shaft axis hole and pump shaft through hole.Another way be by being directly molded or directly casting,
Form the pump shaft with the pump shaft axis hole and pump shaft through hole.
In another preference, the axial force balance structure of the centrifugal water pump be applied to multi-stage centrifugal pump (such as：Two
Level, three-level centrifugal water pump).When for multi-stage centrifugal pump, axial force balance structure of the invention is applied to close to centrifugal water
The transformation of impeller and axle at pump intake, other impellers and shaft part keep original structure constant.
In another preference, the axial force balance structure of the centrifugal water pump is applied to single stage single suction volute pump, single-stage
Double suction centrifugal pump, centrifugal multistage pump multiple centrifugal pump, self-priming centrifugal pump, motor pump and Diesel engine pump etc..
It is not particularly limited suitable for the water pump of the present invention, representational example includes (but being not limited to)：Delivery pump, follow
Ring pump, fire pump, dredge pump, measuring pump, infusion pump, defoaming pump, process pump, oil transfer pump, feed pump, draining pump, drainage pump etc..
In addition, the water pump of the present invention is applicable to a variety of media, wherein representational water pump include it is (but and unlimited
In)：Clarified water pump, sewage pump, sea water pump, heat-exchanger pump, hot oil pump.
In another embodiment, the sprayable macromolecule of each component surface of the axial force balance structure of the centrifugal water pump is answered
Condensation material, its surface is formed hydraulically smooth surface, reduce the layering of fluid in pump, so as to reduce pump internal turbulence, reduce
Pump internal loss, so as to reduce power consumption, improves the hydraulic efficiency of water pump.In addition, the compactness of figure layer molecular structure, can completely cut off sky
The contact of the media such as gas and water and water pump vane mother metal, at utmost reduce electrochemical corrosion and corrosion.
The computational methods of the centrifugal water pump pump shaft intensity：
The maximum shear stress that the pump shaft of centrifugal water pump can bear, should in the pump shaft material range of stress allowed to bear,
That is the torsional strength condition of pump shaft is：
τmax=T/W≤[τ] is 1.
In formula：τmaxThe maximum shear stress of-pump shaft；
[τ]-pump shaft material allowable stress；
The moment of torsion of T- pump shaft transmission；
W- Torsion Section coefficients.
Wherein, when the pump shaft of centrifugal water pump is solid, its Torsion Section coefficient Ws：
Ws=π D3/16 ②
In formula：The solid pump shaft diameters of D-；
When the pump shaft of centrifugal water pump is hollow, its Torsion Section coefficient Wk：
Wk=π D1 3[1-(d/D1)4]/16 ③
In formula：D1- hollow pump shaft diameter；
The hollow parts diameter of d- pump shafts.
It is consistent in pump shaft torque T, when the stress being subject to is identical, study the chi between the solid shafting of same intensity and hollow shaft
Very little relation：According to formula 2. and 3., W is mades=Wk, in the case of drawing same intensity, hollow pump shaft and solid pump shaft size relationship, such as
Shown in Fig. 3.In Fig. 3, abscissa represents D1The diameter ratio of/D, i.e., hollow pump shaft and solid pump shaft, it is corresponding after determining ratio
D/D ordinate values ensure under same intensity that pump shaft hollow parts are relative to the ratio of solid shafting, corresponding mIt is empty/mIt is realIt is i.e. hollow
The weight ratio of pump shaft and solid pump shaft.
Such as：By taking common solid shaft diameter 40mm as an example, in the case where intensity is consistent, using hollow shaft structure
When, consider the factors such as physical dimension, take hollow shaft diameter 42mm, i.e. D1/ D=42/40=1.05, by Fig. 3, i.e. abscissa is
1.05, corresponding d/D values are 0.6375, i.e. hollow shaft hollow parts diameter d=0.6375*40=25.5mm, according to above-mentioned value,
The mass ratio for calculating solid shafting and hollow shaft portion is 0.697, m in corresponding diagram 3It is empty/mIt is realY value.
Main advantages of the present invention include：
(a) hydraulic efficiency of centrifugal water pump is improved.
(b) intensity of centrifugal water pump pump shaft is improved, reduces its weight.
(c) raw material is saved, reduces cost.
(d) component processing is convenient, time saving and energy saving.
(e) centrifugal water pump service life is extended.
Therefore, the present invention can effectively solve the equilibrium problem of centrifugal water pump axial force, improve water pump efficiency, improve pump
The intensity of axle, the weight of pump shaft is decreased, save material cost.
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, accompanying drawing is schematic diagram, therefore apparatus of the present invention and equipment are not shown by described
Size or the ratio limitation of intention.
Embodiment 1：
As shown in figure 1, the axial force balance structure of the centrifugal water pump is applied to one step single sucking formula centrifugal water pump, specifically
Ground, including the pump housing 1, impeller 2, pump shaft 4, mechanical sealing member 5, pump cover 6.The pump shaft 4 is provided with pump shaft at the axle center of impeller end
Axis hole 3, and it is additionally provided with pump shaft through hole 7；The pump shaft through hole 7 and the pump shaft axis hole 3 are to be in fluid communication；The present embodiment
In, the quantity of pump shaft through hole 7 is 2, two pump shaft through holes 7 axle center symmetrical above and below arranged and cross pump shaft 4；Two pump shaft through holes
7 gross area is ∑ St, the area of the pump shaft axis hole 3 is S0, the ratio between the two ∑ St/S0For 1, i.e. two pump shaft through holes 7 up and down
Area sum is the area of pump shaft axis hole 3, fully effectively utilizes the circulation area of pump shaft through hole 7 and pump shaft axis hole 3；Pump shaft 4
Diameter D is 43mm, and the hollow parts diameter d of pump shaft 4 is 18mm, the diameter of axle D of hollow parts diameter d and the pump shaft 4 ratio
D/D is 0.419.Mechanical sealing member 5 realizes the axial face seal to pump shaft 4, prevents leaking for medium.
The pump body is additionally provided with C low-pressure areas, A higher-pressure regions and B nip；When the centrifugal water pump works, fluid
Medium enters C low-pressure areas from import, and after the acting boosting of impeller 2, segment fluid flow medium enters the A higher-pressure regions, segment fluid flow
Medium enters the B nip；Wherein, described B times nip by the impeller 2, the pump shaft 4 and the pump cover 6 boundary
It is fixed；The opening of the pump shaft through hole 7 connects with the B nip, and the opening of the pump shaft axis hole 3 connects with the C low-pressure areas
It is logical, so that the fluid media (medium) of the B nip flows into described C low-pressure areas by pump shaft through hole 7 and pump shaft axis hole 3.
During operation, centrifugal water pump pumped (conveying) medium is drawn into impeller 2 from the low-pressure area C of import 0, passed through with low-pressure state
The acting of impeller 2, exported and sent out from impeller 2 with high pressure conditions, partly into A higher-pressure regions, the fluid media (medium) of A higher-pressure regions, passed through
Gap between impeller 2 and pump cover 6 coordinates, and produces pressure differential so that reaching the fluid media (medium) of B nip turns into time means of press seals Jie
Matter.The fluid media (medium) of B nip enters pump shaft axis hole 3 by pump shaft through hole 7, and it is low to be back to C again after pump shaft axis hole 3 collects
Nip, the pressure for realizing the both sides of impeller 2 are cancelled out each other, and reach balancing axial thrust purpose.
Comparative example 1：
As shown in Fig. 2 existing one step single sucking formula centrifugal water pump, including the pump housing 1, impeller 2, balance pipe 13, pump shaft 4, machine
Tool seal 5, pump cover 6.Centrifugal water pump trandfer fluid medium is with low-pressure state, from the C low-pressure areas intake impeller 2 at import 0, warp
The acting of impeller 2 is crossed, is exported and sent out from impeller 2 with high pressure conditions, forms A areas higher-pressure region, the fluid media (medium) of A higher-pressure regions passes through leaf
Gap between wheel 2 and pump cover 6 coordinates, and produces pressure differential so that reaching the medium of B nip turns into time pressure fluid media (medium).
Balance pipe 13 is opened up on impeller 2, the fluid media (medium) of B nip flows into the entrance C low-pressure areas of impeller 2 by balance pipe 13, realized
The pressure of impeller 2 both sides is cancelled out each other, and reaches balancing axial thrust purpose.Mechanical sealing member 5 is realized close to the axial plane of pump shaft 14
Envelope, prevents leaking for medium.
Embodiment 2：
Centrifugal water pump pump shaft is traditional solid pump shaft before transformation and pump shaft diameter D is 40mm, and it is anti-that it 2. can be calculated according to formula
Turn round section factor WsFor 12566mm3。
After transformation, the Each part of centrifugal water pump is the same as embodiment 1, hollow pump shaft diameter and former solid pump in the present embodiment
The diameter ratio D of axle1During/D=1.05, then its hollow pump shaft diameter D1For 42mm, the hollow parts of pump shaft can be checked according to Fig. 3
Diameter d is 25.5mm, considers manufacturability, value d=25mm, its Torsion Section coefficient W 3. can be calculated according to formulakFor 12721mm3。
Hollow parts axoplasm amount and solid section mass values mIt is empty/mIt is realFor 0.711.
Therefore, it can be seen that when centrifugal water pump pump shaft is hollow pump shaft, its Torsion Section coefficient W is relative to solid pump shaft
It is bigger, illustrate that hollow pump shaft torsional property is better than solid pump shaft, and the quality of hollow pump shaft is again smaller than the weight of solid pump shaft.
Embodiment 3：
Centrifugal water pump pump shaft is traditional solid pump shaft before transformation and pump shaft diameter D is 40mm, and it is anti-that it 2. can be calculated according to formula
Turn round section factor WsFor 12566mm3。
After transformation, the Each part of centrifugal water pump is the same as embodiment 1, hollow pump shaft diameter and former solid pump in the present embodiment
Axle mass ratio D1During/D=1.05, then its hollow pump shaft diameter D1For 42mm, it can be checked according to Fig. 3, the hollow parts of pump shaft are straight
Footpath d is 25.5mm, considers manufacturability, value d=20mm, its Torsion Section coefficient W 3. can be calculated according to formulakFor 13800mm3.It is empty
Center portion split axle quality and solid section mass values mIt is empty/mIt is realFor 0.8525.
Therefore, it can be seen that when centrifugal water pump pump shaft is hollow pump shaft, its Torsion Section coefficient W is relative to solid pump shaft
It is bigger, illustrate that hollow pump shaft torsional property is better than solid pump shaft, and the quality of hollow pump shaft is again smaller than the weight of solid pump shaft.
Embodiment 4：
Centrifugal water pump pump shaft is traditional solid pump shaft before transformation and pump shaft diameter D is 100mm, and it is anti-that it 2. can be calculated according to formula
Turn round section factor WsFor 196350mm3。
After transformation, the Each part of centrifugal water pump is with embodiment 1 in the present embodiment, when hollow pump axoplasm amount and original are solid
Pump shaft pump shaft mass ratio mIt is empty/mIt is realWhen=0.8, corresponding m can be drawn according to Fig. 3It is empty/mIt is realAbscissa numerical value 1.018, now d/D
Corresponding Y value is 0.4855, its hollow pump shaft diameter D1It is for 101.8mm, the hollow parts diameter d of pump shaft
48.55mm, its Torsion Section coefficient W 3. can be calculated according to formulakFor 196430mm3.Intensity and solid shafting are basically identical.
Therefore, it can be seen that when centrifugal water pump pump shaft is hollow pump shaft, when keeping torsional property constant, hollow pump shaft
Weight of the quality again smaller than solid pump shaft.
By the various embodiments described above and comparative example, it can be seen that the axial force balance structure of existing centrifugal water pump exists following
Defect：
1st, hydraulic efficiency is influenceed.The fluid media (medium) of B nip is directly back to the import of impeller by balance pipe, to import
Rotated flowing liquid at runner impacts, and a fluid stream in impeller channel is caused disorder, influences the operational efficiency of water pump.
2nd, part quality hidden danger.Impeller intra vane is not only easily damaged when boring balance pipe at cover plate after the impeller, also to leaf
The structural strength of wheel impacts
3rd, part working process problem.Bore balance pipe on impeller, burr caused by drilling be attached to impeller internal, it is necessary to
Reject in time, influence production efficiency.
For various embodiments of the present invention compared with comparative example, counterbalance effect is basically identical, but the present invention also can reach following effect and excellent
Point：
1st, hydraulic efficiency is improved.The fluid media (medium) of B nip is directly back to the import of impeller by pump shaft axis hole, then flows
Enter impeller inlet, liquid stream at vane inlet is not impacted substantially, ensure that the operational efficiency of water pump.
2nd, pump shaft intensity is improved.By rigorous calculating and experiment, the hollow Pump Axle intensity with appropriate axis hole
It is all higher than solid pump shaft.
3rd, economy.Using pump shaft, reduce the weight of axle, it is cost-effective.
All it is incorporated as referring in this application in all documents that the present invention refers to, it is independent just as each document
It is incorporated as with reference to such.In addition, it is to be understood that after the above-mentioned instruction content of the present invention has been read, those skilled in the art can
To be made various changes or modifications to the present invention, these equivalent form of values equally fall within the model that the application appended claims are limited
Enclose.
Claims (10)
- A kind of 1. axial force balance structure of centrifugal water pump, it is characterised in that the axial force balance structure include the pump housing (1), Impeller (2), pump shaft (4) and pump cover (6)；The pump body is provided with low-pressure area, higher-pressure region and secondary nip；When the centrifugal water pump works, fluid media (medium) is from import Into low-pressure area, after impeller (2) acting boosting, segment fluid flow medium enters the higher-pressure region, and segment fluid flow medium enters institute State time nip；Wherein, described secondary nip between the impeller (2), the pump shaft (4) and the pump cover (6) by defining；Also, the pump shaft (4) is provided with pump shaft axis hole (3) at the axle center of impeller end, and is additionally provided with pump shaft through hole (7)；Institute It is to be in fluid communication to state pump shaft through hole (7) and the pump shaft axis hole (3)；The opening of the pump shaft through hole (7) and the secondary nip Connection, and the opening of the pump shaft axis hole (3) connects with the low-pressure area, so that the fluid media (medium) of the secondary nip passes through Pump shaft through hole (7) and pump shaft axis hole (3) flow into described low-pressure area.
- 2. axial force balance structure as claimed in claim 1, it is characterised in that the axial force balance structure of the centrifugal water pump It is additionally provided with the mechanical sealing member (5) for sealing pump shaft (4).
- 3. axial force balance structure as claimed in claim 1, it is characterised in that the quantity of the pump shaft through hole (7) is 1-4 It is individual.
- 4. axial force balance structure as claimed in claim 3, it is characterised in that the quantity of the pump shaft through hole (7) is 2, The pump shaft through hole (7) crosses axle center, and symmetrical.
- 5. axial force balance structure as claimed in claim 1, it is characterised in that the gross area of the pump shaft through hole (7) is ∑ St, the area of the pump shaft axis hole (3) is S0, the ratio between the two ∑ St/S0For 0.7-1.5.
- 6. axial force balance structure as claimed in claim 1, it is characterised in that when necessary electromotor power is 11kW~160kW When, the diameter D of the pump shaft (4) is 35mm~70mm.
- 7. axial force balance structure as claimed in claim 1, it is characterised in that when necessary electromotor power is 11kW~160kW When, the hollow parts diameter d of the pump shaft (4) is 12mm~30mm.
- 8. the axial force balance structure as described in claim 6 and 7 is any, it is characterised in that the hollow parts diameter d and institute The ratio d/D for stating the diameter of axle D of pump shaft (4) is 0.05~0.75.
- 9. axial force balance structure as claimed in claim 1, it is characterised in that the impeller (2) opens up balance pipe.
- 10. axial force balance structure as claimed in claim 1, it is characterised in that the axial force balance knot of the centrifugal water pump Structure is applied to multi-stage centrifugal pump.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610817516.4A CN107806439B (en) | 2016-09-09 | 2016-09-09 | Axial force balancing structure of centrifugal water pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610817516.4A CN107806439B (en) | 2016-09-09 | 2016-09-09 | Axial force balancing structure of centrifugal water pump |
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| CN107806439A true CN107806439A (en) | 2018-03-16 |
| CN107806439B CN107806439B (en) | 2024-02-23 |
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| CN201610817516.4A Active CN107806439B (en) | 2016-09-09 | 2016-09-09 | Axial force balancing structure of centrifugal water pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112377272A (en) * | 2020-11-30 | 2021-02-19 | 陕西博旭新能源科技有限公司 | Centripetal turbine axial force adjusting device |
| CN113606184A (en) * | 2021-08-26 | 2021-11-05 | 江苏大学 | Centrifugal pump with self-balancing axial force |
| CN114060286A (en) * | 2020-08-07 | 2022-02-18 | 日立安斯泰莫株式会社 | Two-stage centrifugal pump |
| CN114439770A (en) * | 2021-12-20 | 2022-05-06 | 陕西航天动力高科技股份有限公司 | Compact marine water cannon booster centrifugal pump |
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