CN103742453B - Range hood centrifugal fan with double air inlet structure - Google Patents
Range hood centrifugal fan with double air inlet structure Download PDFInfo
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- CN103742453B CN103742453B CN201310742965.3A CN201310742965A CN103742453B CN 103742453 B CN103742453 B CN 103742453B CN 201310742965 A CN201310742965 A CN 201310742965A CN 103742453 B CN103742453 B CN 103742453B
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Abstract
The invention discloses a range hood centrifugal fan with a double air inlet structure. The range hood centrifugal fan comprises a volute and an impeller arranged in the volute, the volute comprises a front cover plate, a rear cover plate, an annular middle shell and volute tongues, the annular middle shell is connected between the front cover plate and the rear cover plate, a motor is arranged at the center of the impeller, each volute tongue is provided with a volute tongue surface projecting along a direction far away from the joint of the volute tongue and the shell, each volute tongue surface comprises a front inclined curved surface and a rear inclined curved surface which are asymmetric and are in smooth transition connection, and the intersecting line of the two inclined curved surfaces is the outermost projection of the volute tongue surface. By the aid of the bidirectionally inclined volute tongues, distribution of the inclined curved surfaces conforms to airflow velocity distribution, a new noise source generated at the volute tongue more effectively offsets part of original noise, and noise reduction capacity is improved. The intersecting line of the two inclined curved surfaces of each bidirectionally inclined volute tongue is aligned to a central disk of the impeller as far as possible, the inclined directions of the volute tongues corresponding to air inlets in two sides of the double air inlet impeller are consistent, and better noise reduction effects are achieved.
Description
Technical field
The present invention relates to a kind of range hood, especially a kind of range hood centrifugal fan with two air inlet structure.
Background technique
Range hood has become one of machine for kitchen use equipment indispensable in Modern Family, and usual range hood comprises top sucking type and side-intake type, and the range hood of top sucking type due to clean and tidy light and handy, take up room the advantage such as little, and in an increasingly wide range of applications.Top-sucking kitchen ventilator generally includes exhaust fume collecting hood, the flow blower casing be positioned on exhaust fume collecting hood, is provided with the motor of spiral case, impeller and drives impeller in flow blower casing.The intake grill of this range hood is positioned at the side of spiral case, is single admission, and incoming air area is little, and oil extraction smoke which is not very desirable.For this reason, also disclosed the range hood of some both sides air inlets at present, the forward and backward cover plate of spiral case all has intake grill, the gap of oil smoke on the intake grill front shroud and back shroud between motor and intake grill enters volute of blower.
And the blower fan of existing range hood mostly is centrifugal blower, operationally can produce noise, be on the one hand produced by blower fan itself, and another aspect is air-flow motion turbulization and noise of causing in volute of blower.In order to reduce noise, many denoising structures are disclosed at present, application number as the applicant is the Chinese patent of 200610050639.6, disclose the blower volute structure of the double-faced ventilated European type cooker hood of a kind of energy, front shroud is 7.3:18.5 with back shroud at the ratio of the radius of curvature of the edge contour at snail tongue place in the radius of curvature of the edge contour at snail tongue place, make air-flow produce a new noise source at snail tongue place, effectively can offset a part of former noise on the contrary with the noise phase place that air-flow produces along other positions of middle casing; And for example the application number of the applicant is the Chinese patent of 200610050640.9, disclose the blower volute structure of the double-faced ventilated European type cooker hood of a kind of energy, front shroud is 8:18.5 in the radius of curvature of edge contour at snail tongue place and the ratio of the radius of curvature of the edge contour of back shroud, snail tongue radius from front shroud backward cover plate strengthen continuously, form a conical surface, simultaneously along with the increasing tongue body bus of snail tongue radius also produces inclination angle relative to axis before and after spiral case.
Above-mentioned document all have employed " active noise reduction " principle, the frequency of impeller outlet air-flow to the Rotation Noise that snail tongue shock vibration produces is distributed vertically there is certain phase difference, abatement to a certain extent can be obtained after the dephased noise source of this tool (noise source that especially phase place is contrary) superposition, be conducive to reducing Rotation Noise.But, it is uneven that impeller outlet air-flow due to centrifugal blower distributes vertically, single intake air impeller outlet becomes large by end circle gradually to hub disk flow velocity, and two intake air impeller exit velocity becomes large by front end circle gradually to mid-game, to be enclosed to rear end by mid-game again and diminish gradually, so this structure is rational for the centrifugal blower of single air intake, but for can the centrifugal blower of both sides air inlet just not too suitable, only have unidirectional incline tongue just not meet this velocity distribution of air-flow, noise reduction is limited.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned prior art Problems existing, provides a kind of range hood centrifugal fan with two air inlet structure of effective reduction noise.
The present invention solves the problems of the technologies described above adopted technological scheme: a kind of range hood centrifugal fan with two air inlet structure, include spiral case and be arranged on the impeller in spiral case, described spiral case comprises front shroud, back shroud, be connected to the middle casing of the ring-type between front shroud and back shroud, and snail tongue, described impeller central is provided with motor, it is characterized in that, described snail tongue has the snail lingual surface protruded away from the direction with middle casing joint in court, described snail lingual surface comprises the asymmetric top rake curved surface and rear-inclined curved surface that are connected smoothly, and be the most evagination place of snail lingual surface at the intersection place of two inclination curved surfaces, described snail tongue comprises the front-end face be connected with front shroud and the ear end face be connected with back shroud, and the profile line of described front-end face is made up of the first straightway of rounding off, the first arc section, the first helical segment, the profile line of described ear end face is made up of the second straightway, the second arc section, the second helical segment, the intersection profile line of described top rake curved surface and rear-inclined curved surface is made up of the 3rd straightway, three-arc section, the 3rd helical segment, above-mentioned three groups of profile lines do not overlap mutually along the axis projection of motor, the curved surface being linked to be continuously smooth between front-end face profile line and intersection profile line forms above-mentioned top rake curved surface, and the curved surface being linked to be continuously smooth between ear end face profile line and intersection profile line forms above-mentioned rear-inclined curved surface, the radius of described first arc section and the radius of described second arc section, be all set to 1.2 ~ 2.5 with the ratio of the radius of described three-arc section.
For improving noise reduction capability further, described impeller includes front end circle, rear end is enclosed, and the mid-game be arranged between front end circle and rear end circle, the intersection place plane of described top rake curved surface and rear-inclined curved surface and the midplane of described mid-game are along the distance <5mm of the axial direction of motor, namely the intersection of two inclination curved surfaces of inclined in two-way snail tongue aligns with the mid-game of impeller as far as possible, ensure the snail tongue true dip direction that the both sides intake grill of the impeller of two air intake is corresponding consistent (all tilting from two, impeller end circle to impeller central disc), to obtain better noise reduction.
For better ensureing the shape of snail tongue, described snail tongue is shaping separately, described front-end face is connected with front shroud, described ear end face is connected with back shroud, described snail tongue also comprises the face that to be relatively fixed with snail lingual surface, the connection plane of the middle casing end of described stationary plane and described spiral case is fixed, thus can reduce the difficulty of processing of snail tongue.
Multiple blade is fixed with between described front end circle and rear end circle, the outlet end undulate flexuose of described blade, the position that blade trailing edge wake's flow field comes off can be changed thus, thus the distance increased between center of vorticity, inhibit Shedding Vortex to the disturbance of wake, and then reduce the aerodynamic noise that the unsteady pressure of blade surface and wake's flow field cause.
Compared with prior art, the invention has the advantages that: the snail tongue adopting inclined in two-way, make the distribution of its curved surface that tilts meet the Velocity Profiles of two intake air impeller, a part of former noise of the more effective counteracting of new noise source that snail tongue place is produced, improve noise reduction capability; The intersection of two inclination curved surfaces of inclined in two-way snail tongue is alignd with the mid-game of impeller as far as possible, ensures that the snail tongue true dip direction that the both sides intake grill of the impeller of two air intake is corresponding is consistent, to obtain better noise reduction; Make the noise spectrum scope of the frequency spectrum of new noise source and kitchen ventilator close as far as possible, to offset the original noise of range hood better; Snail tongue is manufactured separately shaping, can difficulty of processing be reduced, to guarantee the shape of snail tongue.
Accompanying drawing explanation
Fig. 1 is the perspective view of centrifugal blower of the present invention;
Fig. 2 is the plan view of centrifugal blower of the present invention;
Fig. 3 is that the A-A of Fig. 2 is to sectional view;
Fig. 4 is the structural representation of snail tongue of the present invention;
Fig. 5 is the structural representation of middle casing of the present invention;
Fig. 6 is the edge contour figure that spiral case front shroud of the present invention launches projection;
Fig. 7 is the edge contour figure that spiral case back shroud of the present invention launches projection;
Fig. 8 is that the A-A of spiral case middle casing of the present invention is to profile edge profile diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
See Fig. 1-Fig. 3, a kind of range hood centrifugal fan with two air inlet structure, includes spiral case 1, the impeller 2 in spiral case 1, for the motor 3 of drives impeller 2, and the intake grill circle 4 of spiral case 1 air inlet.
Wherein, spiral case 1 comprises front shroud 11, back shroud 12, is connected to the middle casing 13 of the ring-type between front shroud 11 and back shroud 12, and snail tongue 14.Impeller 2 includes front end circle 21 and rear end circle 22, between front end circle 21 and rear end circle 22, be fixed with multiple blade 23, and blade 23 and front end enclose 21, rear end is enclosed 22 and is fixed together with the riveting method of existing routine.Also be provided with mid-game 24 between front end circle 21 and rear end circle 22, the structure of two-way air intake can be formed thus.The central position of mid-game 24 is fixed with wheel disc 25 by rivet, thus, can be fixed on wheel disc 25 by motor 3, and motor 3 is positioned at the side near rear end circle 22, its axially enclose with front end 21 with rear end enclose 22 distinguish vertical.Outlet end (trailing edge towards impeller radial outside) the undulate flexuose of blade 23, the position that blade trailing edge wake's flow field comes off can be changed thus, thus the distance increased between center of vorticity, inhibit Shedding Vortex to the disturbance of wake, and then reduce the aerodynamic noise that the unsteady pressure of blade surface and wake's flow field cause.
See Fig. 4 and Fig. 5, snail tongue 14 includes front-end face 141, ear end face 142, snail lingual surface between front-end face 141 and ear end face 142, and the end for middle casing 13 with spiral case 1 relative with snail lingual surface is connected the fixing stationary plane 144 of plane 131.In the present embodiment, snail tongue 14 can be shaping separately, its front-end face 141 is joined merga pass screw with the front shroud 11 of spiral case 1 and is fixedly connected with, and ear end face 142 is joined merga pass screw with the back shroud 12 of spiral case 1 and is fixedly connected with, and also fixes by screw etc. between stationary plane 144 and connection plane 131.The shaping difficulty of processing reducing snail tongue 14 separately, better to ensure the shape of snail tongue 14.The front end of middle casing 13, the profile line of rear end overlap along motor 3 axis projection.
Snail lingual surface is the asymmetric curved surface towards protruding away from the direction connecting plane 131, comprise top rake curved surface 1431 and rear-inclined curved surface 1432, being connected smoothly between top rake curved surface 1431 and rear-inclined curved surface 1432, is the most evagination place of snail lingual surface in the joint of two curved surfaces.The midplane of the intersection place plane of top rake curved surface 1431 and rear-inclined curved surface 1432 and the mid-game 24 of impeller 2 is along the distance <5mm of the axial direction of motor 3, namely the intersection of inclined in two-way snail tongue 14 two inclination curved surfaces is made to align with the mid-game 24 of impeller 2 as far as possible, ensure snail tongue 14 true dip direction that the both sides intake grill of the impeller 2 of two air intake is corresponding consistent (all tilting from 2 two, impeller end circle to impeller 2 mid-game 24), to obtain better noise reduction.
See Fig. 6, at snail tongue 14 place, consistent with the profile line of the front-end face 141 of snail tongue 14, this profile line is by the first straightway A of rounding off
1b
1, the first arc section B
1c
1, the first helical segment C
1d
1composition, the first arc section B
1c
1radius be R1.See Fig. 7, at snail tongue 14 place, consistent with the profile line of the ear end face 142 of snail tongue 14, this profile line is by the second straightway A
2b
2, the second arc section B
2c
2, the second helical segment C
2d
2composition, the second arc section B
2c
2radius be R2.See Fig. 8, at snail tongue 14 place, be the profile line of the top rake curved surface 1431 of snail tongue 14 and the intersection of rear-inclined curved surface 1432, this profile line is made up of the 3rd straightway AB, three-arc section BC, the 3rd helical segment CD, and the radius of three-arc section BC is R.
Above-mentioned three groups of profile lines do not overlap mutually along the axis projection of motor 3, front-end face 141 profile line A
1b
1c
1d
1with the curved surface being linked to be continuously smooth between intersection profile line ABCD forms above-mentioned top rake curved surface 1431, ear end face 142 profile line A
2b
2c
2d
2with the curved surface being linked to be continuously smooth between intersection profile line ABCD forms above-mentioned rear-inclined curved surface 1432.Noise due to range hood is a continuous spectrum in 6.3Hz to 20KHz scope, and the air-flow at snail tongue 14 place forms a new continuous spectrum noise source, for this reason by the first arc section B
1c
1radius R 1 and the second arc section B
2c
2radius R 2 be set to 1.2 ~ 2.5 times of the radius R of three-arc section BC respectively, the noise spectrum scope of the frequency spectrum of new noise source and kitchen ventilator can be made close as far as possible, to offset the original noise of range hood better.
Claims (4)
1. one kind has the range hood centrifugal fan of two air inlet structure, include spiral case (1) and be arranged on the impeller (2) in spiral case (1), described spiral case (1) comprises front shroud (11), back shroud (12), be connected to the middle casing (13) of the ring-type between front shroud (11) and back shroud (12), and snail tongue (14), described impeller (2) center is provided with motor (3), it is characterized in that, described snail tongue (14) has the snail lingual surface protruded away from the direction with middle casing (13) joint in court, described snail lingual surface comprises the asymmetric top rake curved surface (1431) and rear-inclined curved surface (1432) that are connected smoothly, and be the most evagination place of snail lingual surface at the intersection place of two inclination curved surfaces, described snail tongue (14) comprises front-end face (141) and ear end face (142), and the profile line of described front-end face (141) is by the first straightway (A of rounding off
1b
1), the first arc section (B
1c
1), the first helical segment (C
1d
1) composition, the profile line of described ear end face (142) is by the second straightway (A
2b
2), the second arc section (B
2c
2), the second helical segment (C
2d
2) composition, the intersection profile line of described top rake curved surface (1431) and rear-inclined curved surface (1432) is made up of the 3rd straightway (AB), three-arc section (BC), the 3rd helical segment (CD), above-mentioned three groups of profile lines do not overlap mutually along the axis projection of motor (3), front-end face (141) profile line (A
1b
1c
1d
1) and intersection profile line (ABCD) between be linked to be continuously smooth curved surface form above-mentioned top rake curved surface (1431), ear end face (142) profile line (A
2b
2c
2d
2) and intersection profile line (ABCD) between be linked to be continuously smooth curved surface form above-mentioned rear-inclined curved surface (1432), described first arc section (B
1c
1) radius (R1) and described second arc section (B
2c
2) radius (R2), be 1.2 ~ 2.5 with the ratio of the radius (R) of described three-arc section (BC).
2. there is the range hood centrifugal fan of two air inlet structure as claimed in claim 1, it is characterized in that, described impeller (2) includes front end circle (21), rear end circle (22), and be arranged on front end circle (21) and rear end and enclose mid-game (24) between (22), the intersection place plane of described top rake curved surface (1431) and rear-inclined curved surface (1432) and the midplane of described mid-game (24) are along the distance <5mm of the axial direction of motor (3).
3. there is the range hood centrifugal fan of two air inlet structure as claimed in claim 1, it is characterized in that, described snail tongue (14) is shaping separately, described front-end face (141) is connected with front shroud (11), described ear end face (142) is connected with back shroud (12), described snail tongue (14) also comprises the face (144) that to be relatively fixed with snail lingual surface, and described stationary plane (144) is fixed with the connection plane (131) of middle casing (13) end of described spiral case (1).
4. there is the range hood centrifugal fan of two air inlet structure as claimed in claim 2, it is characterized in that, multiple blade (23) is fixed with, the outlet end undulate flexuose of described blade (23) between described front end circle (21) and rear end circle (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310742965.3A CN103742453B (en) | 2013-12-30 | 2013-12-30 | Range hood centrifugal fan with double air inlet structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310742965.3A CN103742453B (en) | 2013-12-30 | 2013-12-30 | Range hood centrifugal fan with double air inlet structure |
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| Publication Number | Publication Date |
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| CN103742453A CN103742453A (en) | 2014-04-23 |
| CN103742453B true CN103742453B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310742965.3A Active CN103742453B (en) | 2013-12-30 | 2013-12-30 | Range hood centrifugal fan with double air inlet structure |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847698A (en) * | 2015-05-25 | 2015-08-19 | 中国船舶重工集团公司第七○二研究所 | Low-noise diversion volute of range hood |
| CN106640715A (en) * | 2016-10-20 | 2017-05-10 | 上海朗兹环保科技有限公司 | Air system device and air purifier |
| CN106568109B (en) * | 2016-11-11 | 2019-07-26 | 宁波方太厨具有限公司 | A kind of application has the range hood of noise reduction impeller |
| CN106762837B (en) * | 2016-12-16 | 2023-04-14 | 宁波方太厨具有限公司 | Centrifugal fan volute for range hood |
| CN106765404B (en) * | 2016-12-29 | 2022-10-21 | 宁波方太厨具有限公司 | Cooking fume exhauster |
| CN109424585B (en) * | 2017-08-31 | 2024-01-16 | 宁波方太厨具有限公司 | Runoff fan volute tongue structure |
| CN109519416B (en) * | 2017-09-19 | 2024-01-16 | 宁波方太厨具有限公司 | Centrifugal fan |
| CN110067775A (en) * | 2018-01-24 | 2019-07-30 | 青岛海尔智慧厨房电器有限公司 | Volute tongue structure, fan volute and range hood |
| CN108869405B (en) * | 2018-06-05 | 2020-08-14 | 广东海信家电有限公司 | Double-air-inlet centrifugal fan and range hood |
| CN110939607A (en) | 2018-09-25 | 2020-03-31 | 开利公司 | Fan shell, fan and operation system provided with fan |
| CN111173764A (en) * | 2020-03-12 | 2020-05-19 | 江苏兆胜科技股份有限公司 | Double-air-inlet centrifugal fan |
| CN114109924B (en) * | 2020-08-28 | 2023-04-14 | 宁波方太厨具有限公司 | Impeller, fan system applying same and range hood |
| CN112253543B (en) * | 2020-09-30 | 2022-04-15 | 宁波方太厨具有限公司 | Volute, centrifugal fan applying volute and range hood |
| CN112664479B (en) * | 2020-10-20 | 2022-04-19 | 宁波方太厨具有限公司 | Fume exhaust fan |
| WO2024130503A1 (en) * | 2022-12-19 | 2024-06-27 | 中国航天空气动力技术研究院 | Asymmetric impeller and multi-blade centrifugal fan |
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| CN203770236U (en) * | 2013-12-30 | 2014-08-13 | 宁波方太厨具有限公司 | Range hood centrifugal fan with double air inlet structures |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5499105U (en) * | 1977-12-26 | 1979-07-12 | ||
| US6200093B1 (en) * | 1998-12-02 | 2001-03-13 | Lg Electronics, Inc. | Sirocco fan |
| JP2007146817A (en) * | 2005-11-30 | 2007-06-14 | Daikin Ind Ltd | Multiblade centrifugal blower |
| CN202280660U (en) * | 2011-09-15 | 2012-06-20 | 美的集团有限公司 | Centrifugal fan volute of range hood |
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| CN203770236U (en) * | 2013-12-30 | 2014-08-13 | 宁波方太厨具有限公司 | Range hood centrifugal fan with double air inlet structures |
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