CN102182707A - Centrifugal fan for range hood and volute profile generation method thereof - Google Patents
Centrifugal fan for range hood and volute profile generation method thereof Download PDFInfo
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- CN102182707A CN102182707A CN 201110118687 CN201110118687A CN102182707A CN 102182707 A CN102182707 A CN 102182707A CN 201110118687 CN201110118687 CN 201110118687 CN 201110118687 A CN201110118687 A CN 201110118687A CN 102182707 A CN102182707 A CN 102182707A
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Abstract
A centrifugal fan for a range hood and a volute profile generation method thereof are provided, wherein the centrifugal fan comprises a volute provided with an air inlet and an air outlet, an impeller arranged in the volute, an air inlet ring arranged on the air inlet and a motor for driving the impeller to rotate; the volute comprises a volute top plate, a volute enclosing plate and a volute bottom plate, the volute enclosing plate is connected between the volute top plate and the volute bottom plate, and the volute is characterized in that the contour line of the inner side molded surface of the volute enclosing plate is a volute molded line which is formed by smoothly transiting and connecting a first straight line DE, a first arc line EF, a second arc line FG, a spiral line GH and a second straight line HI. The invention provides a design method of a volute profile of a centrifugal fan for a range hood after considering the problems in the prior art and aiming at the characteristics of large impeller size and small volute size of the centrifugal fan of the range hood, and makes great contribution to improving the air volume, air pressure and efficiency of the centrifugal fan for the range hood and reducing pneumatic noise.
Description
Technical field
The present invention relates to a kind of used for range hood centrifugal blower and spiral case molded lines generation method thereof.
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.The spiral case molded lines of centrifugal blower has determined the shape of spiral case, and air quantity, blast, efficient and the aerodynamic noise of centrifugal blower all had considerable influence.The production method of conventional centrifugal blower volute molded lines is as follows: as shown in Figure 5, the spiral case molded lines is by the first straight line D
1E
1, circular arc E
1F
1, log spiral F
1G
1With the second straight line G
1H
1Smooth transition is formed by connecting.Because range hood need overcome bigger pipe resistance, impeller radius R2 is often bigger, and range hood is subjected to the influence of inner cavity size on the other hand, and the spiral case size is subjected to certain restriction, causes impeller and spiral case not to match.If the spiral case molded lines then can cause following two defectives according to the design method design of routine:
As shown in Figure 5, the log spiral J in the spiral case molded lines
1F
1G
1Equation be based on that " formed angle is directly proportional (promptly between the wind flow that is flow through on the variant cross section of spiral case and this cross section and the initial cross section of spiral case
In the formula, Q
φBe the flow of arbitrary section, Q is for stopping the cross section flow) " hypothesis derive out, but in fact do not having around log spiral J near near a part of impeller outlet air-flow (as Fig. 5 dash area) the spiral case outlet
1F
1G
1Rotational flow, but directly from spiral case outlet D
1H
1Flow out, so, the spiral case molded lines of the method design can cause the impeller outlet air-flow very inhomogeneous, very high near spiral case exit portion (dash area) speed, the nonuniformity of impeller outlet air-flow can further develop deterioration after air-flow enters spiral case, cause producing vortex in the spiral case, air quantity, blast and the efficient of blower fan are all descended significantly, bigger pressure gradient also can cause the eddy current noise to increase in the spiral case.
Also have, adopt the spiral case molded lines of conventional method design, snail tongue place and impeller can be very little apart from t, can cause the Rotation Noise increase.
Summary of the invention
Purpose of the present invention aims to provide a kind of simple and reasonable, the used for range hood centrifugal blower and spiral case molded lines generation method thereof that can improve centrifugal blower air quantity, blast, efficient and reduction noise, to overcome deficiency of the prior art.
By a kind of used for range hood centrifugal blower of this purpose design, comprise the spiral case that is provided with intake grill and exhaust outlet, be arranged on impeller in the spiral case, be arranged on air intake circle and drives impeller motor rotating on the intake grill; Spiral case comprises spiral case top board, spiral case coaming plate and spiral case base plate, the spiral case coaming plate is connected between spiral case top board, the spiral case base plate, and its structure characteristic is that the spiral case coaming plate is formed by connecting by first plane, first arc surface, second arc surface, helicoid and the second plane smooth transition.
Described helicoid is the constant speed helicoid.
The two ends up and down of described spiral case coaming plate are connected with the outer rim of spiral case top board, spiral case base plate respectively; The spiral case exhaust outlet is provided with the spiral case flange; Intake grill is arranged on the spiral case top board.
A kind of spiral case molded lines of used for range hood centrifugal blower, described centrifugal blower comprise the spiral case that is provided with intake grill and exhaust outlet, be arranged on impeller in the spiral case, be arranged on air intake circle and drives impeller motor rotating on the intake grill; Spiral case comprises spiral case top board, spiral case coaming plate and spiral case base plate, the spiral case coaming plate is connected between spiral case top board, the spiral case base plate, the profile line that it is characterized in that the inboard profile of spiral case coaming plate is described spiral case molded lines, and the spiral case molded lines is formed by connecting by the first straight line DE, the first circular arc line EF, the second circular arc line FG, helix GH and the second straight line HI smooth transition.
Described helix GH is the constant speed helix.
Described helix GH is constant speed helix A
1B
1C
1A part; Described constant speed helix A
1B
1C
1Obtain 1≤75 ° of 30 °≤φ by constant speed helix ABC around its coordinate axes initial point O φ 1 degree that turns clockwise; More any coordinate figure on the described constant speed helix ABC is r and φ, and the equation of this constant speed helix ABC is
0 °≤φ≤360 °, R2 is an impeller radius in the formula, and L is the maximum opening width of constant speed helix ABC.Above-mentioned maximum opening width be the constant speed helix at 0 ° of point and constant speed helix the distance between 360 ° of points.
Described second circular arc line FG and helix GH are tangent at G point place, and put G on the transverse axis OG of coordinate axes, the center of circle O of the second circular arc line FG
1Longitudinal axis OO in coordinate axes
1On.The second circular arc line FG can widen the distance of snail tongue and impeller outlet greatly, reduces Rotation Noise greatly.
A kind of spiral case molded lines generation method of used for range hood centrifugal blower is characterized in that at first, the constant speed of drawing helix ABC; If on it arbitrarily the coordinate figure of any be r and φ, the equation of this constant speed helix ABC is
0 °≤φ≤360 °; In the formula: R2 is the radius of impeller; L is the maximum opening width of constant speed helix ABC;
Then, constant speed helix ABC is obtained constant speed helix A around its coordinate axes initial point O φ 1 degree that turns clockwise
1B
1C
1, 1≤75 ° of 30 °≤φ;
Then, with constant speed helix A
1B
1C
1With the intersection point G of the transverse axis of coordinate axes be the circular arc FG that starting point is drawn tangent with it, and the center of circle O of circular arc line FG
1Longitudinal axis OO in coordinate axes
1On;
Making spiral case egress line ID according to the design needs again, is that starting point is done and constant speed helix A with the I point
1B
1C
1Tangent straight line HI is that starting point is made straight line DE with the I point;
At last, lead fillet FG in the jointing place of straight line DE and circular arc FG and just can obtain complete spiral case molded lines.
Above-mentioned Φ 1 chooses according to the size of spiral case exhaust outlet width L1; When L1＜1.4L, 1＜45 ° of 30 °≤φ; When L1 〉=1.4L, 1≤75 ° of 45 °≤φ.
Adopt the initial cross section of the constant speed helix A1B1C1 of above-mentioned method design to change φ 1 degree into by 0 degree, meet the air flows situation in impeller, the spiral case more, make the air flows in impeller border exit flow and the spiral case more even, can improve air quantity, blast and efficient greatly, reduce the eddy current noise.
The present invention is in considering prior art after the problem, and the characteristics big at range hood centrifugal blower fan blade wheel size, that the spiral case size is little, the design method of centrifugal blower volute molded lines is proposed, thoroughly solved two big shortcomings of traditional range hood spiral case molded lines generation method, the air quantity, blast, efficient and the reduction aerodynamic noise that improve the used for range hood centrifugal blower have been made very big contribution.Its worm frame advantages of simple, the design ingenious, convenient and practical, can improve centrifugal blower air quantity, blast, efficient and reduction noise.
Description of drawings
Fig. 1 is one embodiment of the invention structural representation.
Fig. 2 is the A-A sectional structure schematic representation of Fig. 1.
Fig. 3 is spiral case molded lines generating principle figure of the present invention.
Fig. 4 is constant speed helix generating principle figure of the present invention.
Fig. 5 is the conventional design schematic diagram of existing centrifugal blower volute molded lines.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Referring to Fig. 1-Fig. 2, this used for range hood centrifugal blower comprises the spiral case 1 that is provided with intake grill and exhaust outlet 10, is arranged on impeller 2 in the spiral case 1, is arranged on air intake circle 3 and drives impeller 2 motor rotating 5 on the intake grill; Spiral case 1 comprises spiral case top board 11, spiral case coaming plate 12 and spiral case base plate 13, and spiral case coaming plate 12 is connected between spiral case top board 11, the spiral case base plate 13.Spiral case coaming plate 12 is formed by connecting by first plane, first arc surface, second arc surface, helicoid and the second plane smooth transition.Helicoid is the constant speed helicoid.The two ends up and down of spiral case coaming plate 12 respectively with the outer rim of spiral case top board 11, spiral case base plate 13 by being welded to connect; Spiral case 1 exhaust outlet 10 is welded with spiral case flange 4; Intake grill is arranged on the spiral case top board 11.Air intake circle 3 is fixed on the spiral case top board 11 by screw and/or buckle 111; Spiral case base plate 13 is provided with motor mounting hole 131, motor 5 by screw on spiral case base plate 13.
Referring to Fig. 3 and Fig. 4, the spiral case molded lines of this used for range hood centrifugal blower, described centrifugal blower comprise the spiral case 1 that is provided with intake grill and exhaust outlet 10, be arranged on impeller 2 in the spiral case 1, be arranged on air intake circle 3 and drives impeller 2 motor rotating 5 on the intake grill; Spiral case 1 comprises spiral case top board 11, spiral case coaming plate 12 and spiral case base plate 13, spiral case coaming plate 12 is connected between spiral case top board 11, the spiral case base plate 13, the profile line of its spiral case coaming plate 12 inboard profiles is described spiral case molded lines, and the spiral case molded lines is formed by connecting by the first straight line DE, the first circular arc line EF, the second circular arc line FG, helix GH and the second straight line HI smooth transition.
Helix GH is constant speed helix A
1B
1C
1A part; Described constant speed helix A
1B
1C
1Obtain 1≤75 ° of 30 °≤φ by constant speed helix ABC around its coordinate axes initial point O Φ 1 degree that turns clockwise; More any coordinate figure on the described constant speed helix ABC is that (r, φ), the equation of this constant speed helix ABC is
0 °≤φ≤360 °, R2 is that R2 is a radius size shown in the impeller 2 radius figure in the formula, and L is the maximum opening width (promptly putting the minimum range of C and impeller 2 blade exits) of constant speed helix ABC.
The second circular arc line FG and helix GH are tangent at G point place, and put G on the transverse axis OG of coordinate axes, the center of circle O of the second circular arc line FG (radius is R)
1Longitudinal axis OO in coordinate axes
1On.The second circular arc line FG can widen greatly snail tongue and impeller outlet apart from T (T＞t), reduce Rotation Noise greatly.
Referring to Fig. 3 and Fig. 4, the spiral case molded lines generation method of this used for range hood centrifugal blower, at first, the constant speed of drawing helix ABC; If on it arbitrarily the coordinate figure of any be that (r, φ), the equation of this constant speed helix ABC is
0 °≤φ≤360 °; In the formula: R2 is the radius of impeller 2; L is the maximum opening width of constant speed helix ABC; Then, constant speed helix ABC is obtained constant speed helix A around its coordinate axes initial point O φ 1 degree that turns clockwise
1B
1C
1, 1≤75 ° of 30 °≤φ; Then, with constant speed helix A
1B
1C
1With the intersection point G of the transverse axis of coordinate axes be the circular arc FG that starting point is drawn tangent with it, and the center of circle O of circular arc line FG
1Longitudinal axis OO in coordinate axes
1On; Making spiral case egress line ID according to the design needs again, is that starting point is done and constant speed helix A with the I point
1B
1C
1Tangent straight line HI is that starting point is made straight line DE with the I point; At last, lead fillet FG in the jointing place of straight line DE and circular arc FG and just can obtain complete spiral case molded lines.
Above-mentioned Φ 1 chooses according to the size of spiral case exhaust outlet width L1; When L1＜1.4L, 1＜45 ° of 30 °≤φ; When L1 〉=1.4L, 1≤75 ° of 45 °≤φ.
Claims (7)
1. used for range hood centrifugal blower comprises the spiral case (1) that is provided with intake grill and exhaust outlet (10), is arranged on impeller (2) in the spiral case (1), is arranged on air intake circle (3) and drives impeller (2) motor rotating (5) on the intake grill; Spiral case (1) comprises spiral case top board (11), spiral case coaming plate (12) and spiral case base plate (13), spiral case coaming plate (12) is connected between spiral case top board (11), the spiral case base plate (13), it is characterized in that spiral case coaming plate (12) is formed by connecting by first plane, first arc surface, second arc surface, helicoid and the second plane smooth transition.
2. according to the described used for range hood centrifugal blower of claim 2, it is characterized in that described helicoid is the constant speed helicoid.
3. according to claim 1 or 2 described used for range hood centrifugal blowers, it is characterized in that the two ends up and down of described spiral case coaming plate (12) are connected with the outer rim of spiral case top board (11), spiral case base plate (13) respectively; Spiral case (1) exhaust outlet (10) is provided with spiral case flange (4); Intake grill is arranged on the spiral case top board (11).
4. the spiral case molded lines of a used for range hood centrifugal blower, described centrifugal blower comprise the spiral case (1) that is provided with intake grill and exhaust outlet (10), be arranged on impeller (2) in the spiral case (1), be arranged on air intake circle (3) and drives impeller (2) motor rotating (5) on the intake grill; Spiral case (1) comprises spiral case top board (11), spiral case coaming plate (12) and spiral case base plate (13), spiral case coaming plate (12) is connected between spiral case top board (11), the spiral case base plate (13), the profile line that it is characterized in that the inboard profile of spiral case coaming plate (12) is described spiral case molded lines, and the spiral case molded lines is formed by connecting by the first straight line DE, the first circular arc line EF, the second circular arc line FG, helix GH and the second straight line HI smooth transition;
Described helix GH is constant speed helix A
1B
1C
1A part; Described constant speed helix A
1B
1C
1Obtain 1≤75 ° of 30 °≤φ by constant speed helix ABC around its coordinate axes initial point O φ 1 degree that turns clockwise; More any coordinate figure on the described constant speed helix ABC is r and φ, and the equation of this constant speed helix ABC is
0 °≤φ≤360 °, R2 is impeller (a 2) radius in the formula, and L is the maximum opening width of constant speed helix ABC.
5. according to the spiral case molded lines of the described used for range hood centrifugal blower of claim 4, it is characterized in that described second circular arc line FG and helix GH are tangent at G point place, and put G on the transverse axis OG of coordinate axes, the center of circle O of the second circular arc line FG
1Longitudinal axis OO in coordinate axes
1On.
6. according to the spiral case molded lines generation method of the described used for range hood centrifugal blower of claim 5, it is characterized in that at first the constant speed of drawing helix ABC; If on it arbitrarily the coordinate figure of any be r and φ, the equation of this constant speed helix ABC is
0 °≤φ≤360 °; In the formula: R2 is the radius of impeller (2); L is the maximum opening width of constant speed helix ABC;
Then, constant speed helix ABC is obtained constant speed helix A around its coordinate axes initial point O φ 1 degree that turns clockwise
1B
1C
1, 1≤75 ° of 30 °≤φ;
Then, with constant speed helix A
1B
1C
1With the intersection point G of the transverse axis of coordinate axes be the circular arc FG that starting point is drawn tangent with it, and the center of circle O of circular arc line FG
1Longitudinal axis OO in coordinate axes
1On;
Making spiral case egress line ID according to the design needs again, is that starting point is done and constant speed helix A with the I point
1B
1C
1Tangent straight line HI is that starting point is made straight line DE with the I point;
At last, lead fillet FG in the jointing place of straight line DE and circular arc FG and just can obtain complete spiral case molded lines.
7. according to the spiral case molded lines generation method of the described used for range hood centrifugal blower of claim 6, it is characterized in that φ 1 chooses according to the size of spiral case exhaust outlet width L1; When L1＜1.4L, 1＜45 ° of 30 °≤φ; When L1 〉=1.4L, 1≤75 ° of 45 °≤φ.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110118687 CN102182707B (en) | 2011-05-09 | 2011-05-09 | Centrifugal fan for oil and smoke exhaust machine and method for manufacturing volute profile line thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110118687 CN102182707B (en) | 2011-05-09 | 2011-05-09 | Centrifugal fan for oil and smoke exhaust machine and method for manufacturing volute profile line thereof |
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| CN102182707A true CN102182707A (en) | 2011-09-14 |
| CN102182707B CN102182707B (en) | 2013-10-09 |
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| CN102734220A (en) * | 2012-07-16 | 2012-10-17 | 中国农业大学 | Spiral casing for pneumatic extinguisher |
| CN103511348A (en) * | 2012-06-22 | 2014-01-15 | 特灵国际有限公司 | Blower housing |
| CN103512065A (en) * | 2012-06-21 | 2014-01-15 | 博西华电器（江苏）有限公司 | Ventilator and spiral case thereof |
| CN104696282A (en) * | 2014-12-30 | 2015-06-10 | 博耐尔汽车电气系统有限公司 | Design method of profile of volute of centrifugal fan |
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
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| CN102734220A (en) * | 2012-07-16 | 2012-10-17 | 中国农业大学 | Spiral casing for pneumatic extinguisher |
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| CN104696282B (en) * | 2014-12-30 | 2018-04-27 | 博耐尔汽车电气系统有限公司 | A kind of centrifugal blower volute design method |
| CN104847699A (en) * | 2015-05-19 | 2015-08-19 | 宁波方太厨具有限公司 | Centrifugal fan volute structure |
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| CN106642485A (en) * | 2016-11-23 | 2017-05-10 | 国统电器科技（惠州）有限公司 | Small ultrasonic humidifier |
| CN107965472B (en) * | 2017-05-08 | 2024-04-16 | 宁波方太厨具有限公司 | Centrifugal fan volute for range hood |
| CN107965472A (en) * | 2017-05-08 | 2018-04-27 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
| CN107975496A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN107975496B (en) * | 2017-05-23 | 2024-04-02 | 宁波方太厨具有限公司 | Centrifugal fan spiral case |
| CN107975497A (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 |
| CN109681469A (en) * | 2017-10-18 | 2019-04-26 | 宁波方太厨具有限公司 | Centrifugal blower volute structure |
| CN109681469B (en) * | 2017-10-18 | 2023-11-17 | 宁波方太厨具有限公司 | Volute structure of centrifugal fan |
| WO2020048203A1 (en) * | 2018-09-04 | 2020-03-12 | 宁波奥克斯电气股份有限公司 | Air channel assembly and air conditioner |
| CN109973438A (en) * | 2019-04-24 | 2019-07-05 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN110145493A (en) * | 2019-04-24 | 2019-08-20 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute for range hood |
| CN109973438B (en) * | 2019-04-24 | 2021-01-19 | 宁波方太厨具有限公司 | Volute of centrifugal fan |
| CN114109909A (en) * | 2020-09-01 | 2022-03-01 | 佛山市顺德区美的洗涤电器制造有限公司 | Volute, centrifugal fan, range hood and volute generation method |
| CN114109909B (en) * | 2020-09-01 | 2024-03-26 | 佛山市顺德区美的洗涤电器制造有限公司 | Volute, centrifugal fan, range hood and volute generation method |
| CN112253541A (en) * | 2020-09-25 | 2021-01-22 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan, volute and centrifugal fan |
| WO2022116240A1 (en) * | 2020-12-04 | 2022-06-09 | 中山大洋电机股份有限公司 | Volute fan and exhaust fan using same |
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| CN102182707B (en) | 2013-10-09 |
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