CN101984261A - Centrifugal fan volute of oil fume purification device - Google Patents
Centrifugal fan volute of oil fume purification device Download PDFInfo
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- 239000003517 fume Substances 0.000 title claims abstract description 43
- 238000000746 purification Methods 0.000 title abstract 2
- 241000237858 Gastropoda Species 0.000 claims description 84
- 230000007704 transition Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 102000012078 E2F2 Transcription Factor Human genes 0.000 claims description 5
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- 238000000926 separation method Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009792 diffusion process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 238000010992 reflux Methods 0.000 description 4
- 238000010411 cooking Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 239000000779 smoke Substances 0.000 description 1
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Abstract
The invention relates to a centrifugal fan volute of an oil fume purification device, which comprises a volute top plate (1), a volute bottom plate (3), a volute enclosing plate (2) and a volute flange (6), wherein an air inlet (11) is formed in the volute top plate (1), an air outlet (61) is formed in the volute flange (6), the plane where the air outlet (61) is located inclines towards one side of the volute bottom plate (3) and is not perpendicular to the plane where the air inlet (11) is located, the volute top plate (1) and the volute bottom plate (3) are in an asymmetric structure at the position of a volute tongue, the volute tongue of the volute top plate (1) is a wing-shaped head and adopts a deep tongue form, the volute tongue of the volute bottom plate (3) is a wing-shaped head and adopts a flat tongue form, and the volute enclosing plate (2) at the position of the volute tongue. The volute with the wing-shaped inclined volute tongue can greatly reduce the probability of flow separation and backflow at the volute tongue, reduce the impact loss, and is beneficial to improving the air quantity, the air pressure and the efficiency of the centrifugal fan and reducing the pneumatic noise.
Description
Technical field
The present invention is a kind of centrifugal blower volute of fume purifier of fume, belongs to the renovation technique of the centrifugal blower volute of fume purifier of fume.
Background technique
At present, cooking fume control equipment has become one of requisite kitchen fitting of ordinary family.Centrifugal blower is big with its suction, advantages such as noise is low, compact structure obtain extensive use in cooking fume control equipment.Because the centrifugal blower that some cooking fume control equipments of the needs of structure require to be adopted is a single admission, and volute of blower outlet be tilt (that is to say that plane, spiral case exhaust outlet place is towards spiral case base plate lopsidedness, with plane, spiral case intake grill place out of plumb), such as near-absorption type smoke machine (seeing accompanying drawing 1), the integrated kitchen range of side-suction lower discharging blower fan underneath type (seeing accompanying drawing 2), the European cigarette machine of part (seeing accompanying drawing 3) of blower fan underlying, also have the two smoking machines (seeing accompanying drawing 4) in side top.
Have tongue structure near the centrifugal blower volute outlet, be called the snail tongue, its effect is that the air-flow of guiding spiral case outlet is shunted, and prevents that portion gas from circulating in spiral case.According to the length of snail tongue and the snail tongue difference from the radial distance of impeller, the snail tongue is divided into forms such as sharp tongue, dark tongue, shallow tongue peace tongue.The point tongue is the longest, the shortest from the radial distance of impeller, and is the most favourable to air quantity, blast and efficient, but the noise maximum; And flat tongue is the shortest, the longest from the radial distance of impeller, and to air quantity, blast and efficient least favorable, but noise is best.Centrifugal blower for single admission, because air-flow need turn over 90 ° from the impeller inlet to the impeller outlet, there is bigger flow separation at impeller outlet near the shroud side, form the vortex of low speed, so just cause impeller outlet speed skewness vertically, near impeller hub disk side speed height, low near impeller shroud side speed.If adopt straight snail tongue, just can't take into account this uneven impeller outlet air-flow.Adopt sharp tongue, favourable to low speed exit flow near impeller shroud side, can reduce this part air-flow greatly and produce the probability that refluxes, but unfavorable to high speed exit flow near impeller hub disk side, can produce very big Rotation Noise.Adopt flat tongue then favourable to high speed exit flow near impeller hub disk side, but very unfavorable to low speed exit flow near impeller shroud side, being easy to produce and refluxing, air quantity, blast and efficient all can sharply descend.In addition, because the spiral case outlet is tilted, if adopt straight snail tongue, because the place's transition of snail tongue has some setbacks, air-flow is bigger in the impact loss at snail tongue place, and air quantity, blast and efficient reduction and noise are increased.
The molded lines of snail tongue all has very big influence to centrifugal blower air quantity, blast, efficient and noise, adopt the snail tongue of traditional design method design to be easy to produce flow separation near the spiral case outlet port above it, form bigger adverse pressure gradient, cause the generation that refluxes, cause portion gas in spiral case, to circulate, reduce air quantity, blast and the efficient of blower fan, also can increase eddy current crack.At the deficiency of snail tongue traditional design method, I just provide a kind of design method of aerofoil profile snail tongue at Chinese invention patent CN200910193447.4 " a kind of centrifugal blower volute of range hood " (notification number is CN101705949A).This method Applicable scope is bigger, and at single admission, the sweptback centrifugal blower of exhaust outlet, this method also needs to be optimized improvement.
Summary of the invention
The objective of the invention is to consider the problems referred to above and provide a kind of be not easy to produce in the outlet port flow separation and backflow at single admission, the sweptback centrifugal blower of exhaust outlet specially, and make the air-flow that is directed to the spiral case outlet as far as possible little to the percussion of snail tongue, improve the centrifugal blower volute of the fume purifier of fume of centrifugal blower air quantity, blast, efficient and reduction noise.The present invention designs ingenious, and is convenient and practical.
Technological scheme of the present invention is: the blower volute structure of fume purifier of fume of the present invention, comprise spiral case top board (1), spiral case base plate (3), spiral case coaming plate (2) and spiral case flange (6), wherein spiral case top board (1) is provided with intake grill (11), spiral case flange (6) is provided with exhaust outlet (61), exhaust outlet (61) plane, place is towards spiral case base plate (3) lopsidedness, with intake grill (11) plane, place out of plumb, spiral case top board (1) and spiral case base plate (3) are dissymmetrical structure at snail tongue place, and the spiral case coaming plate (2) at this place is connected both with the warp surface of continuously smooth transition.
The edge contour of above-mentioned spiral case top board (1) is made up of the first curve A 1B1, the second curve B 1C1, transition camber line C1D1, log spiral D1E1, the first straight line E1F1, the second straight line F1K1, the first curve A 1B1 and the second curve B 1C1 that constitute the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A 1B1 is the leading edge portion of aerofoil profile top airfoil molded lines B1A1G1, and the second curve B 1C1 is the leading edge portion of aerofoil profile lower aerofoil molded lines B1C1G1.The first curve A 1B1 and the first straight line E1F1, the second straight line F1K1 form the outlet diffuser, because diffuser is longer, in order to prevent the excessive flow separation that causes of diffusion angle, the aerofoil profile molded lines that top airfoil molded lines B1A1G1 and lower aerofoil molded lines B1C1G1 form adopts symmetrical airfoil.
The edge contour of above-mentioned spiral case base plate (3) is by tangent and the first curve A 2B2, the second curve B 2C2, transition camber line C2D2, log spiral D2E2, the first straight line E2F2 rounding off form successively, the first curve A 2B2 and the second curve B 2C2 that constitute the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A 2B2 is the leading edge portion of aerofoil profile top airfoil molded lines B2A2G2, and the second curve B 2C2 is the leading edge portion of aerofoil profile lower aerofoil molded lines B2C2G2.The first curve A 2B2 and the first straight line E2F2 form the outlet diffuser, because diffuser is shorter, the aerofoil profile molded lines that top airfoil molded lines B2A2G2 and lower aerofoil molded lines B2C2G2 form both can adopt symmetrical airfoil, also can adopt asymmetric airfoil.
Point (D1, E1, F1) on above-mentioned spiral case top board (1) the edge wheel profile respectively with spiral case base plate (3) edge wheel profile on point (D2, E2, F2) corresponding one by one and overlap along impeller axis direction projection.
The snail tongue of above-mentioned spiral case top board (1) edge wheel profile and the minimum radial distance of impeller (4) are e1, the snail tongue of spiral case base plate (3) edge wheel profile and the minimum radial distance of impeller (4) are e2, the external diameter of impeller (4) is D, at the uneven characteristics of single admission centrifugal blower fan blade wheel distribution of exit velocities, the snail tongue of spiral case top board (1) edge wheel profile adopts dark ligulate formula
And the snail tongue of spiral case base plate (3) edge wheel profile adopts flat ligulate formula
The angle of above-mentioned spiral case exhaust outlet (61) plane, place and intake grill (11) place plane normal direction is φ, and is long in order to prevent spiral case top board (1) outlet diffuser, 0 degree＜φ≤30 degree.
The aerofoil profile that the snail tongue of above-mentioned spiral case top board (1) edge wheel profile is adopted is that conventional symmetrical airfoil forms by convergent-divergent, the mean camber line of aerofoil profile is a straight line, the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 1, in order to prevent to export diffuser diffusion angle excessive (can cause flow separation easily) or too small (less than 5 degree diffusion DeGrains), 20 degree≤φ, 1≤80 degree greater than 45 degree.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case top board (1) edge wheel profile is adopted is H1, the minimum range of A1 point and transition camber line C1D1 is L1 on spiral case top board (1) the edge wheel profile, for the snail tongue that guarantees spiral case top board (1) edge wheel profile is dark ligulate formula
The aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted can be symmetrical airfoil, its molded lines is that conventional symmetrical airfoil forms by convergent-divergent, the mean camber line of aerofoil profile is a straight line, the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 4, in order to prevent to export diffuser diffusion angle excessive (can cause flow separation easily) or too small (less than 5 degree diffusion DeGrains), 20 degree≤φ, 4≤80 degree greater than 45 degree.
The aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted also can be asymmetric airfoil, and what its generation method adopted is the method for the conventional symmetrical airfoil thickness of stack on mean camber line.
The mean camber line B2J2G2 of the asymmetric airfoil that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is single circular arc.
The aerofoil profile string of a musical instrument of the asymmetric airfoil that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted and the angle of horizontal datum are established angle, this established angle is φ 3, in order to prevent to export diffuser diffusion angle excessive (can cause flow separation easily) or too small (less than 5 degree diffusion DeGrains), 0 degree＜φ, 3＜10 degree greater than 45 degree.
The tangent line that the airfoil mean line B2J2G2 of the asymmetric airfoil that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is ordered at B2 and the angle of horizontal datum are stagger angle φ 2, and φ 2 is identical with the flow angle of impeller outlet, 20 degree≤φ, 2≤80 degree.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is H2, the minimum range of A2 point and transition camber line C2D2 is L2 on spiral case base plate (3) the edge wheel profile, for the snail tongue that guarantees spiral case base plate (3) edge wheel profile is flat ligulate formula
The above-mentioned conventional symmetrical airfoil of selecting for use is NACA0012, NACA0015, NACA0018, NACA0020, C-4, BC-6, A40 low speed aerofoil profile.
The structural type that the snail tongue of centrifugal blower volute of the present invention adopts aerofoil profile to tilt, on the one hand, because aerofoil profile has that shunting effect is good, impact loss is low, advantage such as not easily separated flows, so adopt the snail tongue of aerofoil profile leading edge portion as centrifugal blower, can prevent from above the snail tongue, to produce the degree of flow separation or reduction flow separation near the spiral case outlet port, avoid forming bigger adverse pressure gradient, reduce greatly and produce the probability that refluxes, can effectively improve air quantity, blast and the efficient of blower fan, play the effect that reduces eddy current crack simultaneously.In addition, the head of aerofoil profile snail tongue is streamlined, can alleviate the percussion of air-flow to the snail tongue, thereby can reduce rotational noise.On the other hand, the snail tongue of (near the impeller shroud) edge wheel profile adopts dark ligulate formula because the spiral case top board, and the snail tongue of spiral case bottom edge profile line adopts flat ligulate formula, has thoroughly like this overcome because the inhomogeneous problem that causes of impeller outlet velocity distribution.In addition, adopt inclination snail tongue, can make the pulsing airflow phase shifting that acts on the snail tongue, reduce the impulsive force on the snail tongue, thereby reached the effect that reduces rotational noise.
The present invention is that a kind of design is ingenious, function admirable, the centrifugal blower volute of convenient and practical fume purifier of fume.
Description of drawings
Fig. 1 is for adopting the nearly smoking machine schematic representation of tilting blower fan;
Fig. 2 is for adopting the integrated kitchen range schematic representation of tilting blower fan;
Fig. 3 is for adopting the European cigarette machine schematic representation of tilting blower fan;
Fig. 4 is for adopting the two smoking machine schematic representation in side top of tilting blower fan;
Fig. 5 is the sweptback centrifugal blower structural representation of single admission, exhaust outlet;
Fig. 6 is the structural representation of centrifugal blower volute of the present invention;
Fig. 7 is the projection view of Fig. 6 along the A direction;
Fig. 8 is the projection view of Fig. 7 along the B direction;
Fig. 9 is the design principle figure of spiral case top board molded lines of the present invention;
Figure 10 is the design principle figure of spiral case base plate molded lines of the present invention (snail tongue molded lines adopts asymmetric airfoil);
Figure 11 is the design principle figure of spiral case base plate molded lines of the present invention (snail tongue molded lines adopts symmetrical airfoil);
Figure 12 is the generating principle figure of aerofoil profile molded lines of the present invention; I is conventional airfoil structure, and II is new airfoil structure.
Embodiment
Embodiment 1:
The structural representation of the centrifugal blower volute of fume purifier of fume of the present invention is shown in Fig. 5～10,12, comprise spiral case top board 1, spiral case base plate 3, spiral case coaming plate 2 and spiral case flange 6, wherein spiral case top board 1 is provided with intake grill 11, spiral case flange 6 is provided with exhaust outlet 61, plane, exhaust outlet 61 place is towards spiral case base plate 3 lopsidedness, with plane, intake grill 11 place out of plumb, spiral case top board 1 and spiral case base plate 3 are dissymmetrical structure at snail tongue place, and the spiral case coaming plate 2 at this place is connected both with the warp surface of continuously smooth transition.
As shown in Figure 9, the edge contour of above-mentioned spiral case top board 1 is made up of the first curve A 1B1, the second curve B 1C1, transition camber line C1D1, log spiral D1E1, the first straight line E1F1, the second straight line F1K1, the first curve A 1B1 and the second curve B 1C1 that constitute the snail tongue are the leading edge portion of symmetrical airfoil molded lines, wherein the first curve A 1B1 is the leading edge portion of symmetrical airfoil top airfoil molded lines B1A1G1, the second curve B 1C1 is the leading edge portion of symmetrical airfoil lower aerofoil molded lines B1C1G1, and top airfoil molded lines B1A1G1 and lower aerofoil molded lines B1C1G1 form the symmetrical airfoil molded lines.
As shown in figure 10, the edge contour of above-mentioned spiral case base plate 3 is by the tangent and first curve A 2B2 of rounding off successively, the second curve B 2C2, transition camber line C2D2, log spiral D2E2, the first straight line E2F2 forms, the first curve A 2B2 and the second curve B 2C2 that constitute the snail tongue are the leading edge portion of asymmetric airfoil molded lines, wherein the first curve A 2B2 is the leading edge portion of asymmetric airfoil top airfoil molded lines B2A2G2, the second curve B 2C2 is the leading edge portion of asymmetric airfoil lower aerofoil molded lines B2C2G2, and top airfoil molded lines B2A2G2 and lower aerofoil molded lines B2C2G2 form the asymmetric airfoil molded lines.
Wherein the some D1 on the spiral case top board 1 edge wheel profile, E1, F1 respectively with spiral case base plate 3 edge wheel profiles on some D2, E2, F2 corresponding one by one and overlap along impeller axis direction projection.
The snail tongue of above-mentioned spiral case top board 1 edge wheel profile and the minimum radial distance of impeller 4 are e1, the snail tongue of spiral case base plate 3 edge wheel profiles and the minimum radial distance of impeller 4 are e2, the external diameter of impeller 4 is D, at the uneven characteristics of single admission centrifugal blower fan blade wheel distribution of exit velocities, the snail tongue of spiral case top board 1 edge wheel profile adopts dark ligulate formula
And the snail tongue of spiral case base plate 3 edge wheel profiles adopts flat ligulate formula
The angle of above-mentioned spiral case exhaust outlet plane, 61 place and intake grill 11 place plane normal directions is φ, 0 degree＜φ≤30 degree.
The aerofoil profile that the snail tongue of above-mentioned spiral case top board 1 edge wheel profile is adopted is that conventional symmetrical airfoil forms by convergent-divergent, and the mean camber line of aerofoil profile is a straight line, and the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 1,20 degree≤φ 1≤80 degree.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case top board 1 edge wheel profile is adopted is H1, and the minimum range of A1 point and transition camber line C1D1 is L1 on the spiral case top board 1 edge wheel profile,
What the generation method of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted adopted is the method for the conventional symmetrical airfoil thickness of stack on mean camber line.
The mean camber line B2J2G2 of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted is single circular arc.
The aerofoil profile string of a musical instrument of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted and the angle of horizontal datum are established angle, and this established angle is φ 3,0 degree≤φ 3＜10 degree.
The tangent line that the airfoil mean line B2J2G2 of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted is ordered at B2 and the angle of horizontal datum are stagger angle φ 2,20 degree≤φ 2≤80 degree.
The above-mentioned conventional symmetrical airfoil of selecting for use is NACA0012, NACA0015, NACA0018, NACA0020, C-4, BC-6, A40 low speed aerofoil profile.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted is H2, and the minimum range of A2 point and transition camber line C2D2 is L2 on spiral case base plate (3) the edge wheel profile,
The manufacturing process of this aerofoil profile snail tongue spiral case is the same with traditional snail tongue spiral case, is not described in detail at this.
Embodiment 2:
The structural representation of the centrifugal blower volute of fume purifier of fume of the present invention is shown in Fig. 5～9,11,12, comprise spiral case top board 1, spiral case base plate 3, spiral case coaming plate 2 and spiral case flange 6, wherein spiral case top board 1 is provided with intake grill 11, spiral case flange 6 is provided with exhaust outlet 61, plane, exhaust outlet 61 place is towards spiral case base plate 3 lopsidedness, with plane, intake grill 11 place out of plumb, spiral case top board 1 and spiral case base plate 3 are dissymmetrical structure at snail tongue place, and the spiral case coaming plate 2 at this place is connected both with the warp surface of continuously smooth transition.
As shown in Figure 9, the edge contour of above-mentioned spiral case top board 1 is made up of the first curve A 1B1, the second curve B 1C1, transition camber line C1D1, log spiral D1E1, the first straight line E1F1, the second straight line F1K1, the first curve A 1B1 and the second curve B 1C1 that constitute the snail tongue are the leading edge portion of symmetrical airfoil molded lines, wherein the first curve A 1B1 is the leading edge portion of symmetrical airfoil top airfoil molded lines B1A1G1, the second curve B 1C1 is the leading edge portion of symmetrical airfoil lower aerofoil molded lines B1C1G1, and top airfoil molded lines B1A1G1 and lower aerofoil molded lines B1C1G1 form the symmetrical airfoil molded lines.
As shown in figure 11, the edge contour of above-mentioned spiral case base plate 3 is by the tangent and first curve A 2B2 of rounding off successively, the second curve B 2C2, transition camber line C2D2, log spiral D2E2, the first straight line E2F2 forms, the first curve A 2B2 and the second curve B 2C2 that constitute the snail tongue are the leading edge portion of symmetrical airfoil molded lines, wherein the first curve A 2B2 is the leading edge portion of symmetrical airfoil top airfoil molded lines B2A2G2, the second curve B 2C2 is the leading edge portion of symmetrical airfoil lower aerofoil molded lines B2C2G2, and top airfoil molded lines B2A2G2 and lower aerofoil molded lines B2C2G2 form the symmetrical airfoil molded lines.
Wherein the some D1 on the spiral case top board 1 edge wheel profile, E1, F1 respectively with spiral case base plate 3 edge wheel profiles on some D2, E2, F2 corresponding one by one and overlap along impeller axis direction projection.
The snail tongue of above-mentioned spiral case top board 1 edge wheel profile and the minimum radial distance of impeller 4 are e1, the snail tongue of spiral case base plate 3 edge wheel profiles and the minimum radial distance of impeller 4 are e2, the external diameter of impeller 4 is D, at the uneven characteristics of single admission centrifugal blower fan blade wheel distribution of exit velocities, the snail tongue of spiral case top board 1 edge wheel profile adopts dark ligulate formula
And the snail tongue of spiral case base plate 3 edge wheel profiles adopts flat ligulate formula
The angle of above-mentioned spiral case exhaust outlet plane, 61 place and intake grill 11 place plane normal directions is φ, 0 degree＜φ≤30 degree.
The aerofoil profile that the snail tongue of above-mentioned spiral case top board 1 edge wheel profile is adopted is that conventional symmetrical airfoil forms by convergent-divergent, and the mean camber line of aerofoil profile is a straight line, and the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 1,20 degree≤φ 1≤80 degree.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case top board 1 edge wheel profile is adopted is H1, and the minimum range of A1 point and transition camber line C1D1 is L1 on the spiral case top board 1 edge wheel profile,
The aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted is that conventional symmetrical airfoil forms by convergent-divergent, and the mean camber line of aerofoil profile is a straight line, and the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 4,20 degree≤φ 4≤80 degree.
The maximum ga(u)ge of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate 3 edge wheel profiles is adopted is H2, and the minimum range of A2 point and transition camber line C2D2 is L2 on the spiral case base plate 3 edge wheel profiles,
The above-mentioned conventional symmetrical airfoil of selecting for use is NACA0012, NACA0015, NACA0018, NACA0020, C-4, BC-6, A40 low speed aerofoil profile.
The manufacturing process of this aerofoil profile snail tongue spiral case is the same with traditional snail tongue spiral case, is not described in detail at this.
Claims (11)
1. the centrifugal blower volute of a fume purifier of fume, comprise spiral case top board (1), spiral case base plate (3), spiral case coaming plate (2) and spiral case flange (6), wherein spiral case top board (1) is provided with intake grill (11), spiral case flange (6) is provided with exhaust outlet (61), exhaust outlet (61) plane, place is towards spiral case base plate (3) lopsidedness, with intake grill (11) plane, place out of plumb, spiral case top board (1) and spiral case base plate (3) are dissymmetrical structure at snail tongue place, and the spiral case coaming plate (2) at this place is connected both with the warp surface of continuously smooth transition, it is characterized in that:
1. the edge contour of spiral case top board (1) is made up of the first curve A 1B1, the second curve B 1C1, transition camber line C1D1, log spiral D1E1, the first straight line E1F1, the second straight line F1K1, the first curve A 1B1 and the second curve B 1C1 that constitute the snail tongue are the leading edge portion of symmetrical airfoil molded lines, wherein the first curve A 1B1 is the leading edge portion of symmetrical airfoil top airfoil molded lines B1A1G1, and the second curve B 1C1 is the leading edge portion of symmetrical airfoil lower aerofoil molded lines B1C1G1;
2. the edge contour of spiral case base plate (3) is by tangent and the first curve A 2B2, the second curve B 2C2, transition camber line C2D2, log spiral D2E2, the first straight line E2F2 rounding off form successively, the first curve A 2B2 and the second curve B 2C2 that constitute the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A 2B2 is the leading edge portion of aerofoil profile top airfoil molded lines B2A2G2, and the second curve B 2C2 is the leading edge portion of aerofoil profile lower aerofoil molded lines B2C2G2;
3. the minimum radial distance of the snail tongue of spiral case top board (1) edge wheel profile and impeller (4) is e1, and the snail tongue of spiral case base plate (3) edge wheel profile and the minimum radial distance of impeller (4) they are e2, and the external diameter of impeller (4) is D, wherein,
2. the centrifugal blower volute of fume purifier of fume according to claim 1, it is characterized in that top airfoil molded lines B1A1G1 and lower aerofoil molded lines B1C1G1 form the symmetrical airfoil molded lines, top airfoil molded lines B2A2G2 and lower aerofoil molded lines B2C2G2 form symmetrical airfoil or asymmetric airfoil molded lines, the point (D1, E1, F1) on spiral case top board (1) the edge wheel profile respectively with spiral case base plate (3) edge wheel profile on point (D2, E2, F2) corresponding one by one and overlap along impeller axis direction projection.
3. the centrifugal blower volute of fume purifier of fume according to claim 2 is characterized in that the angle of above-mentioned spiral case exhaust outlet (61) plane, place and intake grill (11) place plane normal direction is φ, 0 degree＜φ≤30 degree.
4. the centrifugal blower volute of fume purifier of fume according to claim 2, it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case top board (1) edge wheel profile is adopted is that conventional symmetrical airfoil forms by convergent-divergent, the mean camber line of aerofoil profile is a straight line, the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 1,20 degree≤φ 1≤80 degree.
5. according to the centrifugal blower volute of each described fume purifier of fume of claim 1 to 4, the maximum ga(u)ge that it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case top board (1) edge wheel profile is adopted is H1, the minimum range of A1 point and transition camber line C1D1 is L1 on spiral case top board (1) the edge wheel profile
6. the centrifugal blower volute of fume purifier of fume according to claim 2, it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is that conventional symmetrical airfoil forms by convergent-divergent, the mean camber line of aerofoil profile is a straight line, the angle of airfoil mean line and horizontal datum is aerofoil profile established angle φ 4,20 degree≤φ 4≤80 degree.
7. the centrifugal blower volute of fume purifier of fume according to claim 2, it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is an asymmetric airfoil, its generation method is the method for the conventional symmetrical airfoil thickness of stack on mean camber line; The mean camber line B2J2G2 of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is single circular arc.
8. the centrifugal blower volute of fume purifier of fume according to claim 7 is characterized in that the aerofoil profile string of a musical instrument of the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted and the angle of horizontal datum are established angle φ 3,0 degree≤φ 3＜10 degree.
9. the centrifugal blower volute of fume purifier of fume according to claim 8, the tangent line that the airfoil mean line B2J2G2 that it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is ordered at B2 and the angle of horizontal datum are stagger angle φ 2,20 degree≤φ 2≤80 degree.
10. according to the centrifugal blower volute of each described fume purifier of fume of claim 6 to 9, the maximum ga(u)ge that it is characterized in that the aerofoil profile that the snail tongue of above-mentioned spiral case base plate (3) edge wheel profile is adopted is H2, the minimum range of A2 point and transition camber line C2D2 is L2 on spiral case base plate (3) the edge wheel profile
11., it is characterized in that the above-mentioned conventional symmetrical airfoil of selecting for use is NACA0012, NACA0015, NACA0018, NACA0020, C-4, BC-6, A40 low speed aerofoil profile according to the centrifugal blower volute of claim 4,6 to 9 each described fume purifier of fume.
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| CN2010105544259A CN101984261B (en) | 2010-11-19 | 2010-11-19 | Centrifugal fan volute of oil fume purification device |
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