CN205559366U - Centrifugal compressor's diffuser - Google Patents
Centrifugal compressor's diffuser Download PDFInfo
- Publication number
- CN205559366U CN205559366U CN201620250531.0U CN201620250531U CN205559366U CN 205559366 U CN205559366 U CN 205559366U CN 201620250531 U CN201620250531 U CN 201620250531U CN 205559366 U CN205559366 U CN 205559366U
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- Prior art keywords
- linear leaf
- line
- diffuser
- leaf
- blade
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Abstract
The utility model discloses a centrifugal compressor's diffuser. Improve the structure of diffuser, further improve its working property and have important using value. The utility model discloses arrange the short blade of a slice in the runner of two adjacent linear leafs, the leading edge of linear leaf is curved surface and slope setting, and the leading edge line is 6~8 with rim plate the central axis's contained angle, the leading edge curvature radius of linear leaf is crescent along rim plate to wheel cap direction, the three zigzag shaped channel that runs through pressure face and suction surface is seted up to the linear leaf, the trailing edge of linear leaf is located and is equipped with the tail edge wingtip on the pressure face. The utility model discloses the short blade that is arranged in adjacent linear leaf runner restraines blade surface airflow separation's emergence, the zigzag shaped channel reduces the pressure differential of pressure face and suction surface, reduces adverse pressure gradient, effective blowdown part blade afterbody suction surface boundary layer separation air current, tail edge's parabola shape winglet can restrain the growth in the wing tip whirlpool of the pressure differential production of traditional airfoil fan trailing edge suction surface and pressure face.
Description
Technical field
This utility model belongs to field of ventilation equipment, relates to centrifugal fan, is specifically related to a kind of centrifugal pressure
The diffuser of contracting machine.
Background technology
Centrifugal compressor is as a kind of energy conversion device, and it is mainly by the rotation of impeller, thus drives
The motion of gas in impeller channel, is the energy of gas the changes mechanical energy of prime mover.Centrifugal compressor
Owing to it has high pressure, steady working condition wide ranges, simple in construction, the feature such as is easily maintained, by extensively
It is applied to the industries such as oil, Aero-Space, metallurgy, chemical industry and mine, and plays an important role.
In centrifugal compressor, diffuser is generally divided into vaneless diffuser and vane diffuser two kinds.Without leaf
Diffuser is commonly constituted circular passage by two planomurals and is formed.Vaneless diffuser simple structure, makes
Valency is low, and performance curve is mild, and steady working condition is wider, and inefficient the most inconspicuous when Mach number is higher,
But flow angle is basically unchanged in vaneless diffuser, air-flow moves substantially along helical line, road of flowing
Journey is longer, and friction loss is relatively big, and efficiency is less than vane diffuser under design conditions.Typically expand without leaf
Depressor often uses in the compressor that pressure is smaller.It is big that vane diffuser has diffusion degree, and size is little
Feature, less than vaneless diffuser in the loss of design conditions downstream, thus efficiency is higher.Vane diffuser
Can increase deceleration diffusion by radius, radial blade can make flow angle by wishing angular deflection simultaneously, makes
Circulation area strengthens to improve diffusion ability further；And it is improving efficiency and the level of centrifugal compressor
Pressure ratio, changes optimal working point position, expands stable operation range and plays a very important role.
But vane diffuser is due to the existence of blade, variable working condition impact loss is relatively big, and efficiency declines substantially.
Compressor is the most all operated under low discharge state, and under low discharge, diffuser vane inlet gas manifold
Become high incidence, when the angle of attack reaches certain value, runner easily occurs serious air-flow separate.And once
Suction surface boundary-layer air-flow occurrence of large-area separates, and easily makes compressor enter stall flutter state, thus
Have a strong impact on the job stability of electromotor.If flow is more than design discharge, again easily at blade diffusion
There is choking phenomenon in device throat, makes vane diffuser lose diffusion ability.
Generally for improving diffuser service behaviour, compressor can use airfoil blade, although airfoil type
Blade is better than general version type Blade Properties, but is still unavoidable from due to impeller outlet air-flow not
When uniformity and variable working condition, the angle of attack becomes big and causes efficiency to decline, therefore, on the basis of wing blades
Improve the structure of diffuser, improve its service behaviour further and there is highly important using value and work
Prospect.
Summary of the invention
The purpose of this utility model is for excessive the asking of the diffuser intake air-flow angle of attack under low flow rate condition
Topic, it is provided that the diffuser of a kind of centrifugal compressor, this diffuser is positioned at the short leaf in adjacent linear leaf runner
Sheet can guide airflow direction to change, and changes the flow angle distribution in diffuser runner, makes more
Air-flow can flow along air stream surface, the generation that suppression blade surface air-flow separates, and the most not only improves
The work efficiency of diffuser, also increases working range.Fold-line-shaped conduit in diffuser can reduce
Pressure face and the pressure differential of suction surface, reduce adverse pressure gradient, effectively blow down partial blade afterbody suction surface attached
Surface layer separation bubble.The parabola shaped winglet of trailing edge can suppress traditional airfoil trailing edge suction surface
With the growth of the wingtip vortex that the pressure differential of pressure face produces, the position making wingtip vortex come off is the most mobile, fall
The low intensity of wingtip vortex.
This utility model includes linear leaf, short blade, wheel disc and wheel cap；Described linear leaf has 12,
It is evenly distributed on wheel disc；Arranging a piece of short blade in the runner of adjacent two panels linear leaf, short blade leans on
The pressure face side of nearly linear leaf.The costa of short blade and linear leaf pressure face is on same longitudinal section
Section is positioned to take turns on the disk center's same circumference as the center of circle, and on this circumference, the costa of short blade
Central angle folded by section and the costa section of adjacent two panels linear leaf is respectively 9 ° and 21 °.
The leading edge of linear leaf is curved surface and is obliquely installed, the angle of costa and wheel disc central axis be 6～
8°；The leading edge radius of curvature of linear leaf is gradually increased along wheel disc to wheel cap direction.Linear leaf offers three
Run through the fold-line-shaped conduit of pressure face and suction surface.The shape of three fold-line-shaped conduits is identical, along linear leaf
Length direction be arranged side by side, and the length of three fold-line-shaped conduits by the leading edge of linear leaf to trailing edge direction
It is gradually reduced.Described fold-line-shaped conduit is two-part groove, and leading portion is air inlet section, and back segment is air outlet section,
The groove width of air inlet section and air outlet section is 10mm；The upper wall surface of fold-line-shaped conduit and the distance of linear leaf blade root
For the 45% of linear leaf height, lower wall surface and distance is linear leaf height the 5% of linear leaf blade root.
The trailing edge of linear leaf is positioned at pressure face and is provided with trailing edge wingtip；The side of described trailing edge wingtip and pressure
Angle between the tangent plane at trailing edge of the face is 90 °；The width value of trailing edge wingtip is along wheel disc to wheel cap direction
Regular increase parabolically, is 0 near wheel disc position width, and Breadth Maximum is less than linear leaf chord length
5%.
Described linear leaf uses wing-shaped structure, and the linear leaf screwed hole that bolt is offered with linear leaf is connected,
Linear leaf is fixed on wheel disc.
Described short blade uses wing-shaped structure, height and length to be the 0.7 of linear leaf；Bolt is with short
The short blade screwed hole that blade is offered connects, and is fixed on wheel disc by short blade.
The air inlet section of described three fold-line-shaped conduits enters centrage and the linear leaf of opening's edge linear leaf short transverse
Arc length shared between suction surface costa accounts for 1/3, the 1/2 of linear leaf suction surface arc length respectively
With 2/3.
On the longitudinal section of linear leaf, the air inlet section centrage relative vane molded line of fold-line-shaped conduit with enter
The inclination angle of gas section centrage point of intersection tangent line is 45 °, air outlet section centrage relative vane molded line with give vent to anger
The inclination angle of section centrage point of intersection tangent line is 30 °.
The beneficial effects of the utility model:
This utility model can improve the problem of diffuser inlet air-flow angle of attack change under variable working condition, is positioned at
Short blade in adjacent linear leaf runner can guide airflow direction to change, and changes diffuser runner
Interior flow angle distribution, enables more air-flow to flow along air stream surface, and suppression blade surface air-flow divides
From generation, prevent the generation of surge.The most reasonable range of operation of centrifugal fan, simultaneously can
Improve diffusion ability and the operational efficiency of diffuser.The incline structure of linear leaf leading edge makes diffuser inlet exist
The diverse location in leaf height direction and impeller outlet keep different distances, adjust from impeller high speed three out
Unit's air-flow, especially reduces the gasflow mach number at diffuser inlet, reduces impact loss.And short leaf
The existence of sheet can effectively improve incident air flow angle when variable working condition.After air-flow enters diffuser runner,
Fold-line-shaped conduit in diffuser can reduce the pressure differential of pressure face and suction surface, reduces adverse pressure gradient,
Effectively blow down partial blade afterbody suction surface boundary-layer separation bubble, thus reduce boundary-layer Disengagement zone
Area, increases the real area size of blade path, improves the flow of compressor.The parabolic of trailing edge
Linear winglet can suppress the wing of traditional airfoil trailing edge suction surface and the pressure differential generation of pressure face
The growth in point whirlpool, the position making wingtip vortex come off is the most mobile, reduces the intensity of wingtip vortex, reduces
Aerodynamic noise, improves the performance that diffuser is overall.
Accompanying drawing explanation
Fig. 1 is overall structure axonometric chart of the present utility model；
Fig. 2 is long and short blade distribution schematic diagram on wheel disc in this utility model；
Fig. 3 is a side isometric view of linear leaf in this utility model；
Fig. 4 is another side isometric view of linear leaf in this utility model；
Fig. 5 is the partial enlarged drawing of Fig. 4；
Fig. 6 is the fold-line-shaped conduit schematic cross-section of linear leaf in this utility model；
Fig. 7 is the structural perspective of short blade in this utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment the utility model is described in further detail.
As illustrated in fig. 1 and 2, the diffuser of a kind of centrifugal compressor, including linear leaf 1, short blade 2,
Wheel disc 3 and wheel cap；Linear leaf 1 has 12, is evenly distributed on wheel disc；Adjacent two panels linear leaf
Arranging a piece of short blade 2 in runner, short blade 2 is near the pressure face side of linear leaf.Short blade 2 He
The costa of linear leaf 1 pressure face section on same longitudinal section is positioned to take turns same as the center of circle of disk center
On one circumference, and on this circumference, the leading edge of the costa section of short blade 2 and adjacent two panels linear leaf
Central angle folded by line section is respectively α=9 ° and β=21 °.
Such as Fig. 3, shown in 4 and 5, linear leaf 1 uses wing-shaped structure, the length that bolt is offered with linear leaf 1
Blade screwed hole 1-2 connects, and is fixed on wheel disc 3 by linear leaf 1；Leading edge 1-1 of linear leaf is bent
Face and being obliquely installed, costa is 6 ° with the angle of wheel disc central axis；The leading edge curvature of linear leaf half
Footpath is gradually increased along wheel disc to wheel cap direction.Linear leaf 1 offers three and runs through pressure face and suction surface
Fold-line-shaped conduit 1-3.The shape of three fold-line-shaped conduits is identical, along linear leaf 1 length direction side by side
Arrange, and the length of three fold-line-shaped conduits is gradually reduced to trailing edge direction by the leading edge of linear leaf 1.Folding
Linear conduit is two-part groove, and leading portion is air inlet section, and back segment is the groove of air outlet section, air inlet section and air outlet section
Width is 10mm；The air inlet section of three fold-line-shaped conduits enters centrage and the length of opening's edge linear leaf short transverse
Arc length shared between blade suction surface costa account for respectively linear leaf 1 suction surface arc length 1/3,
1/2 and 2/3.
As shown in Figure 6, on the longitudinal section of linear leaf 1, the air inlet section centrage of fold-line-shaped conduit is relative
Vane type line is 45 ° at the inclination angle with air inlet section centrage point of intersection tangent line, and air outlet section centrage is relative to leaf
Sheet molded line is 30 ° at the inclination angle with air outlet section centrage point of intersection tangent line.
The upper wall surface of fold-line-shaped conduit and distance is linear leaf 1 height the 45% of linear leaf 1 blade root, under
Wall and distance is linear leaf 1 height the 5% of linear leaf 1 blade root.
As it is shown in figure 5, the trailing edge of linear leaf is positioned at pressure face is provided with trailing edge wingtip 1-4；Trailing edge wingtip
Angle between the side of 1-4 and the pressure face tangent plane at trailing edge is 90 °；The width of trailing edge wingtip 1-4
Angle value, along wheel disc to wheel cap direction regular increase parabolically, is 0 near wheel disc position width, and maximum
Width is less than the 5% of linear leaf 1 chord length.
As it is shown in fig. 7, short blade 2 uses wing-shaped structure, height and length to be the 0.7 of linear leaf 1；
The short blade screwed hole 2-1 that bolt is offered with short blade 2 is connected, and is fixed on wheel disc 3 by short blade 2.
This utility model is mainly for asking that the diffuser inlet air-flow angle of attack under variable working condition state changes greatly
Topic, the short blade being positioned in adjacent linear leaf runner can guide airflow direction to change, change expansion
Flow angle distribution in depressor runner, enables more air-flow to flow along air stream surface, suppresses blade table
The generation that face air-flow separates, prevents the generation of surge.The most not only improve the reasonable operation of centrifugal fan
Scope, can improve diffusion ability and the operational efficiency of diffuser simultaneously.
The incline structure that linear leaf leading edge uses makes the diffuser inlet diverse location in leaf height direction and impeller
Outlet keeps different distance, have adjusted from impeller uneven air-flow out, greatly reduces diffuser
The free stream Mach number of porch, improves the distribution of inlet air flow, and the impact reducing diffuser inlet is damaged
Lose, thus improve the operational efficiency of diffuser.
As shown in figs. 3 and 6, the channel structure side by side in diffuser further improves air-flow at diffusion
Distribution situation in device runner.Conduit uses broken line type, and air inlet section is front, and air outlet section, rear, accords with
Close the proal feature of air-flow, and conduit UNICOM diffuser pressure face and suction surface, thus reduce
Pressure face and the pressure differential of suction surface, reduce adverse pressure gradient, effectively blow down partial blade afterbody suction surface attached
Surface layer separation bubble, thus reduce the area of boundary-layer Disengagement zone, increase actual of blade path
Long-pending size, not only increases the flow of compressor, and can reduce eddy current crack.
As shown in Figures 4 and 5, linear leaf trailing edge wingtip is distributed along leaf height parabolically type, top width, the end
Portion is narrow, mainly take into account exit flow and also has inhomogeneities along the distribution of leaf height.Wingtip structure can
The increase of suppression wingtip vortex, reduces the intensity of wingtip vortex, reduces resistance.And the suppression of wingtip vortex also makes
Runner exit flowing is more uniform, reduces flow losses.
Claims (5)
1. a diffuser for centrifugal compressor, including linear leaf, short blade, wheel disc and wheel cap, its feature
It is: described linear leaf has 12, is evenly distributed on wheel disc；In the runner of adjacent two panels linear leaf
Arranging a piece of short blade, short blade is near the pressure face side of linear leaf；Before short blade and linear leaf pressure face
Edge line section on same longitudinal section is positioned to take turns on the disk center's same circumference as the center of circle, and at this circumference
On, central angle folded by the costa section of short blade and the costa section of adjacent two panels linear leaf is respectively 9 °
With 21 °；
The leading edge of linear leaf is curved surface and is obliquely installed, and costa is 6～8 ° with the angle of wheel disc central axis；
The leading edge radius of curvature of linear leaf is gradually increased along wheel disc to wheel cap direction；Linear leaf offers three and runs through pressure
Face and the fold-line-shaped conduit of suction surface；The shape of three fold-line-shaped conduits is identical, along linear leaf length direction also
Arrangement is put, and the length of three fold-line-shaped conduits is gradually reduced to trailing edge direction by the leading edge of linear leaf；Described
Fold-line-shaped conduit is two-part groove, and leading portion is air inlet section, and back segment is the groove width of air outlet section, air inlet section and air outlet section
It is 10mm；The upper wall surface of fold-line-shaped conduit and distance is linear leaf height the 45% of linear leaf blade root, under
Wall and distance is linear leaf height the 5% of linear leaf blade root；
The trailing edge of linear leaf is positioned at pressure face and is provided with trailing edge wingtip；The side of described trailing edge wingtip and pressure face exist
The angle between tangent plane at trailing edge is 90 °；The width value of trailing edge wingtip presses parabolic along wheel disc to wheel cap direction
Line regular increase, is 0 near wheel disc position width, and Breadth Maximum is less than the 5% of linear leaf chord length.
The diffuser of a kind of centrifugal compressor the most according to claim 1, it is characterised in that: described
Linear leaf uses wing-shaped structure, and the linear leaf screwed hole that bolt is offered with linear leaf is connected, and is fixed on by linear leaf
On wheel disc.
The diffuser of a kind of centrifugal compressor the most according to claim 1, it is characterised in that: described
Short blade uses wing-shaped structure, height and length to be the 0.7 of linear leaf；The short leaf that bolt and short blade are offered
Sheet screwed hole connects, and is fixed on wheel disc by short blade.
The diffuser of a kind of centrifugal compressor the most according to claim 1, it is characterised in that: described three
The air inlet section of individual fold-line-shaped conduit enters centrage and the linear leaf suction surface costa of opening's edge linear leaf short transverse
Arc length shared by between accounts for 1/3,1/2 and the 2/3 of linear leaf suction surface arc length respectively.
The diffuser of a kind of centrifugal compressor the most according to claim 1, it is characterised in that: coming into leaves
On the longitudinal section of sheet, the air inlet section centrage relative vane molded line of fold-line-shaped conduit with air inlet section centrage intersection point
The inclination angle of place's tangent line is 45 °, and air outlet section centrage relative vane molded line is being cut with air outlet section centrage point of intersection
The inclination angle of line is 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620250531.0U CN205559366U (en) | 2016-03-29 | 2016-03-29 | Centrifugal compressor's diffuser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620250531.0U CN205559366U (en) | 2016-03-29 | 2016-03-29 | Centrifugal compressor's diffuser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205559366U true CN205559366U (en) | 2016-09-07 |
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ID=56812340
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620250531.0U Expired - Fee Related CN205559366U (en) | 2016-03-29 | 2016-03-29 | Centrifugal compressor's diffuser |
Country Status (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095164A1 (en) * | 2016-11-23 | 2018-05-31 | 广东威灵电机制造有限公司 | Multi-stage flow guiding device |
| CN108253488A (en) * | 2018-02-08 | 2018-07-06 | 浙江帅康电气股份有限公司 | A kind of turbine with supercharging fin and the kitchen ventilator comprising the turbine |
| CN108843620A (en) * | 2018-06-06 | 2018-11-20 | 广州陈扬枝科技有限责任公司 | A kind of return channel blade and its design method |
| CN112160942A (en) * | 2020-09-10 | 2021-01-01 | 江苏美的清洁电器股份有限公司 | Diffuser and fan for household electrical appliances |
| CN112228401A (en) * | 2020-09-30 | 2021-01-15 | 大连海事大学 | Slotted vane diffuser |
| CN112762061A (en) * | 2021-01-06 | 2021-05-07 | 南京理工大学 | Device for inhibiting cavitation of suction surface of hydrofoil |
| CN113790175A (en) * | 2021-09-22 | 2021-12-14 | 大连海事大学 | Radial air inlet chamber for improving guide vane wake vortex |
-
2016
- 2016-03-29 CN CN201620250531.0U patent/CN205559366U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095164A1 (en) * | 2016-11-23 | 2018-05-31 | 广东威灵电机制造有限公司 | Multi-stage flow guiding device |
| CN108253488A (en) * | 2018-02-08 | 2018-07-06 | 浙江帅康电气股份有限公司 | A kind of turbine with supercharging fin and the kitchen ventilator comprising the turbine |
| CN108253488B (en) * | 2018-02-08 | 2024-03-29 | 浙江帅康电气股份有限公司 | Turbine with booster fins and range hood comprising turbine |
| CN108843620A (en) * | 2018-06-06 | 2018-11-20 | 广州陈扬枝科技有限责任公司 | A kind of return channel blade and its design method |
| CN108843620B (en) * | 2018-06-06 | 2023-09-19 | 广州陈扬枝科技有限责任公司 | Reflux device blade and design method thereof |
| CN112160942A (en) * | 2020-09-10 | 2021-01-01 | 江苏美的清洁电器股份有限公司 | Diffuser and fan for household electrical appliances |
| CN112228401A (en) * | 2020-09-30 | 2021-01-15 | 大连海事大学 | Slotted vane diffuser |
| CN112762061A (en) * | 2021-01-06 | 2021-05-07 | 南京理工大学 | Device for inhibiting cavitation of suction surface of hydrofoil |
| CN113790175A (en) * | 2021-09-22 | 2021-12-14 | 大连海事大学 | Radial air inlet chamber for improving guide vane wake vortex |
| CN113790175B (en) * | 2021-09-22 | 2024-05-24 | 大连海事大学 | Radial air inlet chamber for improving guide vane wake vortex |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160907 Termination date: 20180329 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |