CN101705949A - Centrifugal fan volute of range hood - Google Patents
Centrifugal fan volute of range hood Download PDFInfo
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- CN101705949A CN101705949A CN200910193447A CN200910193447A CN101705949A CN 101705949 A CN101705949 A CN 101705949A CN 200910193447 A CN200910193447 A CN 200910193447A CN 200910193447 A CN200910193447 A CN 200910193447A CN 101705949 A CN101705949 A CN 101705949A
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- aerofoil profile
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- airfoil
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- range hood
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- 241000237858 Gastropoda Species 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000009527 percussion Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention relates to a volute of a centrifugal fan of a range hood. The molded line of the volute (1) is formed by smoothly and excessively connecting a first curve AB, a second curve BC, a logarithmic spiral CD and a straight line DE, the first curve AB and the second curve BC which form the volute tongue are the leading edge parts of airfoil molded lines, wherein the first curve AB is the leading edge part of an airfoil upper airfoil molded line BAF, the second curve BC is the leading edge part of an airfoil lower airfoil molded line BCF, and the upper airfoil molded line BAF and the lower airfoil molded line BCF form airfoil molded lines. The volute of the centrifugal fan utilizes the airfoil leading edge part with better streamline shape as the molded line of the volute tongue of the centrifugal fan. The volute with the wing-shaped 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 range hood, belongs to the renovation technique of the centrifugal blower volute of range hood.
Background technique
Existing centrifugal blower is big with its suction, advantages such as noise is low, compact structure obtain extensive use in range hood.Spiral case is one of core component of centrifugal blower, and its effect is that the gas that leaves impeller is concentrated, and the guiding spiral case exports, and changes the part dynamic pressure of gas into static pressure.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.The shape of snail tongue and form are to centrifugal blower air quantity, blast, efficient and noise important influence all.The traditional design method of snail tongue is to obtain at the diffuser straight line (or curve) of spiral case outlet and the jointing place rounding of spiral case log spiral.Can be divided into forms such as sharp tongue, dark tongue, shallow tongue peace tongue according to varying in size of fillet R.Because the air-flow of guiding spiral case outlet and the angle of attack of snail tongue are bigger, add the diffusion action of spiral case outlet, 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, reduced air quantity, blast and the efficient of blower fan, also can increase eddy current crack.In addition, the snail tongue is nearest from the rotary blade blade, and the snail tongue that adopts the traditional design method design is because head is more blunt, and air-flow is bigger to the percussion of snail tongue portion, can cause bigger Rotation Noise.
Consider the material impact of snail tongue to centrifugal blower aerodynamic characteristic and acoustic characteristic, people have done some structural improvement to the snail tongue, as disclosing the inclination snail tongue of a kind of R of change among the China Patent No. CN200510060742.4, in addition, China Patent No. is the inclination snail tongue that discloses a kind of R of grade among the CN200420020071.X, China Patent No. is to disclose a kind of noise-reducing volute with stepped spiral tougue among the CN00115736.1, although improving, these on blower fan aeroperformance or noise characteristic, obtain certain effect, but the design method of above-mentioned snail tongue is not all jumped out the traditional design method of snail tongue, and the design method of snail tongue is the progress of achieving no breakthrough property also so far.
Summary of the invention
The objective of the invention is to consider the problems referred to above and a kind of be not easy to produce in the outlet port flow separation and backflow are provided, 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 range hood 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 centrifugal blower volute of range hood of the present invention, the molded lines of spiral case by the first curve A B, the second curve B C, log spiral CD, straight line DE is smooth excessively is formed by connecting, the first curve A B and the second curve B C that constitute the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A B is the leading edge portion of aerofoil profile top airfoil molded lines BAF, the second curve B C is the leading edge portion of aerofoil profile lower aerofoil molded lines BCF, and top airfoil molded lines BAF and lower aerofoil molded lines BCF form the aerofoil profile molded lines.
What the generation method of above-mentioned aerofoil profile molded lines adopted is the method for the conventional symmetrical airfoil thickness of stack on mean camber line.
Above-mentioned airfoil mean line BGF is single circular arc.
The aerofoil profile string of a musical instrument of above-mentioned aerofoil profile and the angle of horizontal datum are established angle, and this established angle is a zero degree; Aerofoil profile string of a musical instrument BF is parallel with spiral case outlet EA.
The tangent line that the airfoil mean line BGF of above-mentioned aerofoil profile is ordered at B and the angle of horizontal datum are stagger angle φ, 20 degree≤φ≤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 above-mentioned aerofoil profile is H, and the minimum range of A point and log spiral CD is L on the spiral case molded lines,
The snail tongue of centrifugal blower volute of the present invention adopts the structure of aerofoil profile, 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.The present invention is that a kind of design is ingenious, function admirable, the centrifugal blower volute of convenient and practical range hood.
Description of drawings
Fig. 1 is the design principle figure of spiral case molded lines of the present invention;
Fig. 2 is the production principle figure of aerofoil profile molded lines of the present invention.
Embodiment
Embodiment:
The structural representation of range hood centrifugal blower volute of the present invention as shown in Figure 1, 2, its spiral case 1 molded lines by the first curve A B, the second curve B C, log spiral CD, straight line DE is smooth excessively is formed by connecting, the first curve A B and the second curve B C that it is characterized in that constituting the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A B is the leading edge portion of aerofoil profile top airfoil molded lines BAF, and the second curve B C is the leading edge portion of aerofoil profile lower aerofoil molded lines BCF.Top airfoil molded lines BAF and lower aerofoil molded lines BCF form the aerofoil profile molded lines.The generation method of aerofoil profile molded lines adopts is the method for standard thickness (conventional symmetrical airfoil thickness) of superposeing on mean camber line, and concrete steps are:
1, selects the type of symmetrical airfoil.The symmetrical airfoil of selecting for use can be the advanced low speed aerofoil profile of NACA0012, NACA0015, NACA0018, NACA0020, C-4, BC-6, A40 or the like, present embodiment is selected the bigger NACA20 symmetrical airfoil of relative thickness for use, its maximum relative thickness is H=20%, and the standard thickness that obtains symmetrical airfoil distributes as follows:
| ??x | ??0 | ??0.0096 | ??0.0381 | ??0.0843 | ??0.1465 | ??0.2222 | ??0.3087 | ??0.4025 | ??0.5000 |
| ??±y | ??0 | ??0.0279 | ??0.0526 | ??0.0732 | ??0.0885 | ??0.0975 | ??0.1000 | ??0.0966 | ??0.0882 |
| ??x | ??0.5976 | ??0.6913 | ??0.7778 | ??0.8536 | ??0.9157 | ??0.9619 | ??0.9904 | ??1.0000 | |
| ??±y | ??0.0764 | ??0.0625 | ??0.0478 | ??0.0335 | ??0.0208 | ??0.0108 | ??0.0043 | ??0.0021 |
2, determine mean camber line BGF equation. what the mean camber line BGF of this aerofoil profile adopted is single circular arc. the stagger angle of aerofoil profile (tangent line that airfoil mean line BGF order at B and the angle of horizontal datum) is φ, 20 degree≤φ≤80 degree, present embodiment is chosen φ=44 ° according to the impeller outlet flow angle. and the maximum ga(u)ge of aerofoil profile is H, the minimum range of A point and log spiral CD is L on the spiral case molded lines
Present embodiment is chosen
Can determine the maximum ga(u)ge H of aerofoil profile, just can obtain the chord length of aerofoil profile
Just can determine the equation of mean camber line BGF according to above calculating;
3, the chord length of the standard thickness of symmetrical airfoil by aerofoil profile | BF| doubly amplifies, and on the mean camber line BGF that is added to then, just can obtain desired aerofoil profile molded lines.
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 (7)
1. the centrifugal blower volute of a range hood, the molded lines that it is characterized in that spiral case (1) by the first curve A B, the second curve B C, log spiral CD, straight line DE is smooth excessively is formed by connecting, the first curve A B and the second curve B C that constitute the snail tongue are the leading edge portion of aerofoil profile molded lines, wherein the first curve A B is the leading edge portion of aerofoil profile top airfoil molded lines BAF, the second curve B C is the leading edge portion of aerofoil profile lower aerofoil molded lines BCF, and top airfoil molded lines BAF and lower aerofoil molded lines BCF form the aerofoil profile molded lines.
2. the centrifugal blower volute of range hood according to claim 1, what it is characterized in that the generation method of above-mentioned aerofoil profile molded lines adopts is the method for the conventional symmetrical airfoil thickness of stack on mean camber line.
3. the centrifugal blower volute of range hood according to claim 2 is characterized in that above-mentioned airfoil mean line BGF is single circular arc.
4. the centrifugal blower volute of range hood according to claim 3 is characterized in that the aerofoil profile string of a musical instrument of above-mentioned aerofoil profile and the angle of horizontal datum are established angle, and this established angle is a zero degree; Aerofoil profile string of a musical instrument BF is parallel with spiral case outlet EA.
5. the tangent line that the centrifugal blower volute of range hood according to claim 4, the airfoil mean line BGF that it is characterized in that above-mentioned aerofoil profile are ordered at B and the angle of horizontal datum are stagger angle φ, 20 degree≤φ≤80 degree.
6. the centrifugal blower volute of range hood according to claim 5 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.
7. the centrifugal blower volute of range hood according to claim 1, the maximum ga(u)ge that it is characterized in that above-mentioned aerofoil profile is H, the minimum range of A point and log spiral CD is L on the spiral case molded lines,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101934474A CN101705949B (en) | 2009-10-30 | 2009-10-30 | Centrifugal fan volute of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101934474A CN101705949B (en) | 2009-10-30 | 2009-10-30 | Centrifugal fan volute of range hood |
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| Publication Number | Publication Date |
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| CN101705949A true CN101705949A (en) | 2010-05-12 |
| CN101705949B CN101705949B (en) | 2011-07-20 |
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| CN2009101934474A Active CN101705949B (en) | 2009-10-30 | 2009-10-30 | Centrifugal fan volute of range hood |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975496A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN108005956A (en) * | 2017-12-30 | 2018-05-08 | 豫新汽车空调股份有限公司 | A kind of volute structure used for automobile air conditioning |
| CN109595626A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
| CN114198324A (en) * | 2021-12-10 | 2022-03-18 | 西安交通大学 | Multi-element coupling centrifugal fan collector, centrifugal fan and preparation method of centrifugal fan collector |
-
2009
- 2009-10-30 CN CN2009101934474A patent/CN101705949B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
| CN104847699B (en) * | 2015-05-19 | 2017-01-18 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975496A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975497B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN107975496B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN109595626A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
| CN109595626B (en) * | 2017-09-30 | 2023-11-17 | 宁波方太厨具有限公司 | Near-suction type range hood |
| CN108005956A (en) * | 2017-12-30 | 2018-05-08 | 豫新汽车空调股份有限公司 | A kind of volute structure used for automobile air conditioning |
| CN108005956B (en) * | 2017-12-30 | 2024-06-07 | 豫新汽车热管理科技有限公司 | Volute structure for automobile air conditioner |
| CN114198324A (en) * | 2021-12-10 | 2022-03-18 | 西安交通大学 | Multi-element coupling centrifugal fan collector, centrifugal fan and preparation method of centrifugal fan collector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101705949B (en) | 2011-07-20 |
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Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
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Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 Penglai Road, Beijiao Town, Shunde District, Guangdong, Foshan Patentee before: Midea Group |