CN108087303A - Injection type centrifugal blower - Google Patents
Injection type centrifugal blower Download PDFInfo
- Publication number
- CN108087303A CN108087303A CN201711391403.3A CN201711391403A CN108087303A CN 108087303 A CN108087303 A CN 108087303A CN 201711391403 A CN201711391403 A CN 201711391403A CN 108087303 A CN108087303 A CN 108087303A
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- China
- Prior art keywords
- section
- petal
- nozzle
- flow
- air
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 24
- 239000007924 injection Substances 0.000 title claims abstract description 24
- 230000008676 import Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 238000005094 computer simulation Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
- 238000012795 verification 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- 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
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
-
- 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
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
Landscapes
- 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)
Abstract
The present invention relates to a kind of injection type centrifugal blowers.The wind turbine mainly includes centrifugal fan, changeover portion air passage and nozzle three parts, and nozzle includes section and is made of rectangle turn circle air duct sections with section by justifying a turn petal air duct sections, is smoothly tightly connected between each several part.It is characterized in that increase by one section of changeover portion air passage and nozzle on the basis of being exported in conventional centrifugal wind turbine rectangular section so that air-flow is not disperseed when leaving impeller, and air-flow is more concentrated, VELOCITY DISTRIBUTION is more uniform；Wind turbine can be made radially out to have the air-flow of certain drift angle gradual to parallel to air passage outer wall in changeover portion air passage, air-flow negative sequence harmonic is avoided to flow, reduces flow resistance, reduces output flow loss；Nozzle tapered portion causes air velocity to increase, and static pressure reduces, and can turn the static gas of petal a part of outside wall surface of air duct sections injection by justifying in section, so as to increase compressor flow under identical operating condition.
Description
Technical field
Patent of the present invention is related to a kind of injection type centrifugal blower, belongs to centrifugal blower technical field.
Background technology
With the continuous development of fan industry, up to the present, wind turbine is widely used in every field, each Ministry of Industry
Door.On the market, centrifugal fan and axial fan are using most commonly seen.The former is primarily adapted for use in small flow, the field of high pressure
Institute, and the latter be primarily adapted for use in big flow, low-pressure environment in.Centrifugal fan at work, air-flow by wind turbine it is axial into
Enter blade space, driven by blade, radially away from impeller, wind turbine is left by the outlet conduits of design.
The unreasonable import and export Duct design of centrifugal fan connection is to cause the weight that wind turbine is contributed, efficiency is relatively low
Want reason.Traditional centrifugal fan is not provided with rational outlet conduits, is only that a very short rectangular section air duct sections are made
For its outlet conduits, in the exit of blade, circumferentially the speed of air-flow and pressure are all non-uniform, the core in exit
Heart stream will disperse, and reduce wind turbine air supplying distance, and the direction of air outlet velocity can also deviate preset direction, and air-flow is leaving rectangle section
Face export when direction will not vertical cross-section, have a certain amount of deflection angle to wind turbine center line.
Therefore, in order to solve the problems, such as outlet conduits design it is unreasonable, it is necessary to existing design is improved, design one
The wind turbine of outlet conduits of the kind with transition zone for diversion and injection air-flow.
The content of the invention
It is an object of the invention in order to overcome the above-mentioned deficiencies of the prior art, design is a kind of in exit guiding air-flow conjunction
Reason flowing increases air output and stablizes the injection type centrifugal blower of core flow rate degree distribution.
The technical proposal of the invention is realized in this way, and the injection type centrifugal blower is by centrifugal fan, changeover portion air passage
It is formed with nozzle three parts；Wherein centrifugal fan is made of fan main body and fan outlet, and nozzle is to be turned by section by rectangle
Circle air duct sections are formed with section by justifying a turn petal air duct sections, and fan outlet connects changeover portion wind by the tangent mode that seamlessly transits
Road, changeover portion air passage opposite side are smoothly connected with nozzle.
In traditional centrifugal fan rectangular section outlet arrangement changeover portion air passage and nozzle, nozzle includes cutting the present invention
Face turns circle air duct sections and section by rectangle and is formed by justifying a turn petal air duct sections, is smoothly tightly connected between each several part.Such cloth
It puts so that air-flow is not disperseed when the rectangular section for leaving centrifugal blower exports, air-flow is more concentrated, VELOCITY DISTRIBUTION is uniform；
Wind turbine can be made radially out to have the air-flow of certain drift angle gradual to parallel to air passage outer wall in changeover portion air passage, avoid air-flow inverse
Pressure gradient flow reduces flow resistance, reduces output flow loss；Nozzle air passage tapered portion causes air velocity to increase,
Static pressure reduces, can be in the static gas of a part of outside wall surface of petal section injection, so as to increase under identical operating condition
Big compressor flow.
A kind of injection type centrifugal blower, it is characterised in that：The cross sectional shape and area in changeover portion air passage are constant, mistake
The path rule for crossing section air passage is two sections of tangent connections of circular arc, that section of circular arc close to fan outlet hangs down with fan outlet area
Directly, that section of circular arc close to nozzle is vertical with nozzle inlet section；It is put down with fan outlet area the outlet in changeover portion air passage
Row.The main function so designed is that wind turbine is made radially out to have the air-flow of certain drift angle gradual to parallel to air passage outer wall, is kept away
Exempt from the flowing of air-flow negative sequence harmonic, reduce flow resistance, reduce output flow loss.
A kind of injection type centrifugal blower, it is characterised in that：Nozzle cross-section is turned the section shape of circle air duct sections by rectangle
Shape is gradually changed from rectangle to circle, and the area of rectangular section is equal with circular cross-sectional area.The main function so designed is
Make VELOCITY DISTRIBUTION of the air-flow on duct cross-section more uniform, be not in the phenomenon that mutually extruding between streamline, be next section
Transitional function is played in the flowing in air passage.
A kind of injection type centrifugal blower, it is characterised in that：Latter section of duct cross-section of nozzle turns petal wind by justifying
For the cross sectional shape in road gradually from circle to petal change in shape, the area of circular cross-section is equal with petal tee section；It is petal
The every petal center line in shape section is equal with the angle that adjacent petal center line surrounds.The main function so designed is
Air passage tapered portion can cause air velocity to increase, and static pressure reduces, can be in a part of static gas of outside wall surface injection.
A kind of injection type centrifugal blower, it is characterised in that：The height of the every petal in petal shape section with most
The ratio of wide director's degree is classified as 1-1.5.So design can allow centrifugal fan to increase compressor flow under identical operating condition.
Description of the drawings
Fig. 1 is a kind of structure diagram of injection type centrifugal blower of patent of the present invention；
Fig. 2 is a kind of planar structure schematic diagram of injection type centrifugal blower of patent of the present invention；
Fig. 3 is the planar structure schematic diagram that nozzle is connected with changeover portion air passage；
Fig. 4 is the structure diagram of nozzle petal tee section；
The structure diagram of Fig. 5 nozzles, wherein（a）Nozzle graphics,（b）Nozzle side view,（c）Nozzle exit is faced
Figure；
The contoured velocity figure in Fig. 6 jet expansions flow field（Ratio is 1）.
The contoured velocity figure in Fig. 7 jet expansions flow field（Ratio is 1.5）.
Figure label title：1- wind turbines；2- changeover portions air passage；3- nozzles；11- fan main bodies；12- fan outlets；21- roads
Radial line；31- sections turn circle air duct sections by rectangle；32- sections turn petal air duct sections by justifying；The flower in 321- petal shapes section
Valve；Region between 322- two panels petals；The height of 3211- petals；The length of 3212- petal the widest part；Two adjacent flowers of 323-
The angle of valve center line
Specific implementation method
The present invention is further described below in conjunction with the accompanying drawings.
It refers to shown in attached Fig. 1 and 2, a kind of injection type centrifugal blower is by centrifugal fan 1, changeover portion air passage 2 and nozzle 3
Three parts form.Centrifugal fan 1 is made of fan main body 11 and fan outlet 12, and nozzle 3 is to turn circle wind by rectangle by section
Road section 31 and section are formed by justifying a turn petal air duct sections 32, and each several part is smoothly tightly connected.Fan outlet 12 is by mutually cutting flat with
Sliding transient mode connection changeover portion air passage 2,2 opposite side of changeover portion air passage is smoothly connected with nozzle 3.Please
Refering to shown in attached drawing 3, the changes of section path-line 21 in changeover portion air passage 2, the changing rule of this line is tangent by two circular arcs
Connection composition, that section of circular arc close to fan outlet 12 is vertical with fan outlet area, close to that section of circular arc and nozzle of nozzle 3
Import section is vertical.
It refers to shown in attached drawing 4,321 center line of every petal in petal shape section and adjacent 321 center line of petal
The angle of the angle 323 surrounded is equal, and the ratio of the height 3211 of petal 321 and the length 3212 of the widest part is 1-1.5.
Special changeover portion air passage 2 and nozzle 3, the air-flow being inhaled by wind turbine axial entrance are installed in wind turbine air-supply outlet
Radially away from impeller after impeller does work, changeover portion air passage 2, this section of air passage are flow in wind turbine rectangular section outlet 12
Effect be that script is scattered with there is the air-flow of certain deflection angle gradual to parallel to 2 outer wall of changeover portion air passage, make air-flow more
Concentration, VELOCITY DISTRIBUTION are more uniform, and negative sequence harmonic is avoided to flow, its is made to reduce flow resistance, reduce output flow loss.When
Air-flow flow to section by justify turn petal air duct sections 32 when, the speed of 321 interior air-flow of region of the every petal in petal shape section
Degree increases, and static pressure reduces, can be with region 322 of the injection part between two panels petal, the i.e. static gas of 3 outside wall surface of nozzle
Body, so as to increase the flow of gas compared with conventional fan under identical operating condition.
Computer simulation experimental verification
Numerical simulation is the powerful of Study of Fluid flowing, and many research institutions are in a new construction or new technology predevelopment phase
Numerical simulation study will be carried out to the new construction or new technology.Numerical simulation can answer wind turbine using Fluid Mechanics Computation
The simulation of miscellaneous flow field problem calculates, and solves fluid motion equation by numerical discretization, discloses wind turbine flow mechanism and flowing law.
It is obtained by Numerical Experiment method validation：Nozzle designed by the present invention goes out compared with traditional rectangular section
Mouthful, the flowing velocity with bigger, farther range, more uniform VELOCITY DISTRIBUTION, more stable core flow.For two groups
Different every petal height of nozzle petal tee section are emulated with the widest part lenth ratio, study designed nozzle to flowing
Improved effect.The ratio of two groups of different petal height and the widest part length is respectively 1 and 1.5.
Following setting is done to boundary condition in fluent softwares：Fluid selects incompressible air, and nozzle inlet is cut
Face uses speed import, and inlet velocity 6m/s is identical with the air-supply average speed of certain conventional fan rectangular section outlet；To spray
1m beyond mouth outlet3Space in fluid flowing carry out numerical simulation, reference pressure 1atm；Nozzle wall surface is arranged to smooth no cunning
Move wall surface.
To 1m beyond jet expansion3Space middle section velocity field analyzed, obtained result as shown in Figure 6 and Figure 7,
Analog result when wherein Fig. 6 is petal height and the ratio of the widest part length is 1, Fig. 7 are petal height and the widest part length
Ratio be 1.5 when analog result.The distribution situation of jet expansion flow field velocity is considered using flow velocity 0.5m/s as border, by scheming
6 and velocity field isogram shown in Fig. 7 can be seen that jet expansion flow uniformity mutually less nozzle it is more preferable, novel spraying
Mouth also can have Involving velocity to fluid in flow field around.Nozzle core velocity flow profile is uniform, it can thus be appreciated that air-flow is leaving impeller
When do not disperseed, air-flow is more concentrated, VELOCITY DISTRIBUTION is more uniform.
Claims (5)
1. a kind of injection type centrifugal blower, it is characterised in that：
The injection type centrifugal blower is by centrifugal fan（1）, changeover portion air passage（2）And nozzle（3）Three parts form；Wherein centrifuge
Formula wind turbine（1）By fan main body（11）And fan outlet（12）Composition, nozzle（3）It is that circle air duct sections are turned by rectangle by section（31）
Turn petal air duct sections by justifying with section（32）Composition, fan outlet（12）Changeover portion wind is connected by the tangent mode that seamlessly transits
Road（2）, changeover portion air passage（2）Opposite side and nozzle（3）It is smoothly connected.
2. injection type centrifugal blower according to claim 1, it is characterised in that：
The changeover portion air passage（2）Cross sectional shape and area it is constant, changeover portion air passage（2）Section path rule be two sections
The tangent connection of circular arc, close to fan outlet（12）That section of circular arc it is vertical with fan outlet area, close to nozzle（3）That section circle
Arc and nozzle（3）Import section is vertical；Changeover portion air passage（2）Outlet and fan outlet（12）Section is parallel.
3. injection type centrifugal blower according to claim 1, it is characterised in that：
The nozzle cross-section turns circle air duct sections by rectangle（31）Cross sectional shape gradually from rectangle to circle change, rectangular section
Area is equal with circular cross-sectional area.
4. injection type centrifugal blower according to claim 1, it is characterised in that：
The nozzle cross-section turns petal air duct sections by justifying（32）Cross sectional shape gradually from circle to petal change in shape, circle
The area of tee section is equal with petal tee section；The every petal in petal shape section（321）Center line and adjacent petal
（321）The angle that center line surrounds is equal.
5. injection type centrifugal blower according to claim 4, it is characterised in that：
The every petal in the petal shape section（321）Height and the widest part length ratio be 1-1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711391403.3A CN108087303A (en) | 2017-12-21 | 2017-12-21 | Injection type centrifugal blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711391403.3A CN108087303A (en) | 2017-12-21 | 2017-12-21 | Injection type centrifugal blower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108087303A true CN108087303A (en) | 2018-05-29 |
Family
ID=62177960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711391403.3A Pending CN108087303A (en) | 2017-12-21 | 2017-12-21 | Injection type centrifugal blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108087303A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219829A (en) * | 2019-06-24 | 2019-09-10 | 广东顺威精密塑料股份有限公司 | A kind of anticentripetal spiral casing export structure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2487898Y (en) * | 2001-06-15 | 2002-04-24 | 卜维平 | Centrifugal jet fan |
| CN201121604Y (en) * | 2007-10-15 | 2008-09-24 | 陈耀乾 | Air blower structure |
| CN101387302A (en) * | 2008-08-18 | 2009-03-18 | 许晓华 | Centrifugal fan for garbage disposer |
| CN102635578A (en) * | 2011-12-23 | 2012-08-15 | 南京航空航天大学 | Multilevel lobed nozzle ejector with secondary-fluid sucking function |
| CN103967815A (en) * | 2013-11-11 | 2014-08-06 | 开县人人有余科技有限公司 | Draught fan comprising multiple air supply channels |
| CN104736936A (en) * | 2012-08-28 | 2015-06-24 | 布罗恩-努托恩有限责任公司 | Ventilation system and method |
| CN205876809U (en) * | 2016-05-30 | 2017-01-11 | 苏州赛腾精密电子股份有限公司 | Fan shell and fan |
| CN207750264U (en) * | 2017-12-21 | 2018-08-21 | 南京航空航天大学 | Injection type centrifugal blower |
-
2017
- 2017-12-21 CN CN201711391403.3A patent/CN108087303A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2487898Y (en) * | 2001-06-15 | 2002-04-24 | 卜维平 | Centrifugal jet fan |
| CN201121604Y (en) * | 2007-10-15 | 2008-09-24 | 陈耀乾 | Air blower structure |
| CN101387302A (en) * | 2008-08-18 | 2009-03-18 | 许晓华 | Centrifugal fan for garbage disposer |
| CN102635578A (en) * | 2011-12-23 | 2012-08-15 | 南京航空航天大学 | Multilevel lobed nozzle ejector with secondary-fluid sucking function |
| CN104736936A (en) * | 2012-08-28 | 2015-06-24 | 布罗恩-努托恩有限责任公司 | Ventilation system and method |
| CN103967815A (en) * | 2013-11-11 | 2014-08-06 | 开县人人有余科技有限公司 | Draught fan comprising multiple air supply channels |
| CN205876809U (en) * | 2016-05-30 | 2017-01-11 | 苏州赛腾精密电子股份有限公司 | Fan shell and fan |
| CN207750264U (en) * | 2017-12-21 | 2018-08-21 | 南京航空航天大学 | Injection type centrifugal blower |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219829A (en) * | 2019-06-24 | 2019-09-10 | 广东顺威精密塑料股份有限公司 | A kind of anticentripetal spiral casing export structure |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180529 |