CN104847699B - Centrifugal fan volute structure - Google Patents
Centrifugal fan volute structure Download PDFInfo
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- CN104847699B CN104847699B CN201510254055.XA CN201510254055A CN104847699B CN 104847699 B CN104847699 B CN 104847699B CN 201510254055 A CN201510254055 A CN 201510254055A CN 104847699 B CN104847699 B CN 104847699B
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- helix
- line
- spiral case
- spiral
- centrifugal blower
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A centrifugal fan volute structure comprises a volute top plate, a volute bottom plate and a volute surrounding plate; a volute molded line comprises a starting line HA and a finishing line FG; the centrifugal fan volute structure is characterized in that the volute molded line between the starting line HA and the finishing line FG is a spiral line; the spiral line comprises a starting spiral line AB connected with the starting line HA, a finishing spiral line EF connected with the finishing line FG and a middle spiral line connected between the starting spiral line and the finishing spiral line; spiral angles of the starting spiral line AB and the finishing spiral line EF are smaller than a spiral angle of the middle spiral line. According to the centrifugal fan volute structure, the spiral line between the starting line and the finishing line is divided into the starting spiral line AB, the finishing spiral line EF and the middle spiral line, and the spiral angles of the starting spiral line AB and the finishing spiral line EF are smaller than the spiral angle of the middle spiral line, so that the designed volute structure meet the actual working conditions; the static pressure close to the starting line is improved and the efficiency close to an optimal working condition is improved, so that the pneumatic and noise performances of a fan are better.
Description
Technical field
The present invention relates to a kind of centrifugal blower volute structure.
Background technology
Centrifugal blower with its suction big, noise is low, compact conformation the advantages of and obtained extensively quoting in range hood.
Spiral case is one of core component of centrifugal blower, and its effect is to concentrate the gas leaving impeller, derives to volute outlet, and will
Dynamic pressure is changed into static pressure.The worm frame of existing centrifugal blower includes spiral case top board, spiral case base plate and connects spiral case top board, spiral case
Remaining molded line in addition to snail tongue position is consistent with spiral case base plate for the spiral case coaming plate of base plate, wherein spiral case top board.Conventional volute design one
As carry out by a metatheory, have two it is assumed that i.e. assume import circumference on flow parameter be uniformly distributed and spiral case interior air-flow move
Amount moment preserving, is usually equiangular helical spiral by the spiral case inlet pressure of unitary Theoretical Design.But actually due to the non-axle pair of volute shape
Claim, the particularly impact of snail tongue, a pressure field heterogeneous can be formed in impeller outlet, impeller outlet will necessarily be made, i.e. snail
Shell inlet flow field is uneven.Due to a metatheory do not consider in spiral case circumferential plane the heterogeneity of import circumference flow parameter with
The impact in flow field, thus not good by this Theoretical Design spiral case performance out, deteriorate more especially in high back pressure working condition
Substantially.Additionally, centrifugal blower volute near exit is provided with snail tongue, the effect of snail tongue is that the gas being directed to volute outlet is carried out
Shunting, prevents portion gas in spiral case internal circulation flow, the shape of snail tongue and form to centrifugal blower air quantity, blast, efficiency with
And noise suffers from material impact.
The worm frame of various centrifugal blowers is also disclosed that, such as Patent No. zl 201110118687.5 in prior art
Disclosed in the Chinese invention patent of (Authorization Notice No. be cn 102182707 b) " a kind of centrifugal blower used for range hood and its
Spiral case inlet pressure generation method ", this spiral case includes spiral case top board, spiral case base plate and spiral case coaming plate, the wheel in spiral case coaming plate medial type face
Profile is spiral case inlet pressure, and spiral case inlet pressure is by first straight line de, the first circular arc line ef, the second circular arc line fg, helix gh, second straight
Line segment hi smoothly transit be formed by connecting although, spiral case adopt above-mentioned spiral case inlet pressure after, be conducive to improve centrifugal blower air quantity, wind
Pressure, efficiency simultaneously reduce aerodynamic noise, but this worm frame is again without taking into full account import circumference flowing in spiral case circumferential plane
The heterogeneity of parameter and the impact in flow field, need to be further improved.
Content of the invention
The technical problem to be solved is for above-mentioned state of the art, provides one kind more to meet blower fan actual
Working environment, the centrifugal blower volute structure that pneumatic and noiseproof feature is more excellent.
The technical scheme that present invention solution above-mentioned technical problem is adopted is: this centrifugal blower volute structure, including spiral case
Top board, spiral case base plate and the spiral case coaming plate being connected between spiral case top board and spiral case base plate, the spiral case inlet pressure of spiral case includes being located at
Spiral case inlet pressure one end simultaneously corresponds to start line ha at snail tongue position and is located at the spiral case inlet pressure other end and adjacent to fan outlet
End lines fg it is characterised in that: the spiral case inlet pressure between described start line ha and end lines fg be helix, described helix bag
Include the initial helix ab being connected with start line ha, the end helix ef being connected with end lines fg and be connected to initial spiral
Line and terminate helix between middle screw spin line, and described initial helix ab and terminate helix fg helical angle be respectively less than
The helical angle of middle screw spin line.
Preferably, described middle screw spin line at least includes two sections of helixes with different helical angles.
In order that the worm frame designed more meets the real work situation of centrifugal blower, described middle screw spin line includes
It is sequentially connected the first helix bc, the second helix cd and the 3rd helix de, and the first helix bc and initial helix ab
It is connected, the 3rd helix de is connected with terminating helix ef, pitch angle alpha=4.1～4.6 ° of described initial helix ab
Pitch angle alpha=4.07～4.81 ° of described first helix bc, pitch angle alpha=4.49 of described second helix cd～
5.51 °, pitch angle alpha=4.32～4.78 ° of described 3rd helix de, pitch angle alpha=3.6 of described end helix ef～
4.05°.
Further preferably, end lines fg are straight line, and this straight line is with respect to inclination angle beta=8～9 ° of vertical direction.
In order to improve optimum condition efficiency nearby further, snail tongue radius of curvature r1 at spiral case top board, snail tongue are the most deep
Snail tongue radius of curvature r2 at air inlet and meet r1:r2:r3=between snail tongue radius of curvature r3 at spiral case base plate
1:1.2～1.4:1.6～1.8.
Further preferably, r1:r2:r3=1:1.3:1.7.After above-mentioned ratio, centrifugal blower can be improved further
The pneumatic and noiseproof feature of spiral case.
Compared with prior art, it is an advantage of the current invention that: this centrifugal blower volute structure by spiral case inlet pressure start line with
Helix between end lines is divided into initial helix ab, terminates helix ef and middle screw spin line, and initial helix ab and
The helical angle terminating helix fg is respectively less than the helical angle of middle screw spin line, so that the worm frame of design more meets blower fan in fact
Border working condition, start line hydrostatic lifting nearby, optimum condition improved efficiency nearby, and then make the pneumatic of blower fan and noiseproof feature
More preferably.
Brief description
Fig. 1 is the structural representation of the embodiment of the present invention；
Fig. 2 is the structural representation of embodiment of the present invention spiral case inlet pressure；
Fig. 3 is the structural representation of the centrifugal blower of the embodiment of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in Figure 1 to Figure 3, in the present embodiment, centrifugal blower volute structure includes spiral case top board 1, spiral case base plate 2 and connects
It is connected on the spiral case coaming plate 3 between spiral case top board 1 and spiral case base plate 2, the spiral case inlet pressure of this spiral case includes start line ha, end lines
Fg, wherein start line ha are located at one end of spiral case inlet pressure and correspond to snail tongue 4 position, and end lines fg are located at the another of spiral case inlet pressure
End neighbouring fan outlet 5.
In the present embodiment, the spiral case inlet pressure between start line ha and end lines fg is helix.Specifically, this helix bag
Include the initial helix ab smoothly transitting successively, middle screw spin line and terminate helix ef, wherein initiate helix ab and initiate
Line ha is connected, and terminates helix ef and is connected with end lines fg, and middle screw spin line specifically includes first smoothly transitting successively
Helix bc, the second helix cd and the 3rd helix de, the first helix bc is connected with initial helix ab, the second spiral
Line is located between the first helix bc and the 3rd helix de, and the 3rd helix de is connected with terminating helix ef.
Each segmentation helix has different helical angles, pitch angle alpha=4.1～4.6 ° of described initial helix ab, and
Pitch angle alpha=4.07～4.81 ° of one helix bc, pitch angle alpha=4.49～5.51 ° of the second helix cd, the 3rd spiral
Pitch angle alpha=4.32～4.78 ° of line de, pitch angle alpha=3.6～4.05 ° of described end helix ef.From above-mentioned helical angle
Scope can deduce, initial helix ab and terminate helix fg helical angle be respectively less than middle screw spin line helical angle.In addition,
In the present embodiment, end lines fg are straight line, and this straight line is with respect to inclination angle beta=8～9 ° of vertical direction.
Additionally, in order to improve fan performance further, at spiral case top board 1 and ao1Snail tongue radius of curvature r1 of h, snail tongue 4 are
Go deep into being ao at air inlet2It is ao at snail tongue radius of curvature r2 of h and spiral case base plate 23Snail tongue radius of curvature r3 of h it
Between meet r1:r2:r3=1:1.2～1.4:1.6～1.8, and, ao2The position of h and impeller 6 mid-game position consistency.In order to obtain
Obtain optimal fan performance, preferred ratio is r1:r2:r3=1:1.3:1.7.
Worm frame in the present embodiment is particularly well-suited to the centrifugal blower of double air intakes, in experiment, for width dimensions
380mm, the centrifugal blower volute for European-style range hood of thickness 180mm, compared with existing common spiral case, worm frame is more
Meet blower fan real work situation, start line hydrostatic lifting nearby, optimum condition improved efficiency nearby, and then make the pneumatic of blower fan
With noiseproof feature more preferably, fan performance is significantly lifted, and such as, standard regulation air quantity static energy is promoted to from 271.4pa
321pa, about lifts 50pa, and standard regulation air quantity total pressure efficiency can lift 11.3%.
The foregoing is only the preferred embodiment of the present invention it is noted that for those of ordinary skills,
Under the premise of the principle without departing from the present invention, the present invention can be carried out with multiple remodeling or improve, these are regarded as the present invention
Protection domain within.
Claims (6)
1. a kind of centrifugal blower volute structure, including spiral case top board (1), spiral case base plate (2) be connected to spiral case top board (1) and snail
Spiral case coaming plate (3) between shell base plate (2), the spiral case inlet pressure of spiral case includes positioned at spiral case inlet pressure one end and corresponds to snail tongue (4)
Start line ha at position and end lines fg that are located at the spiral case inlet pressure other end neighbouring fan outlet (5) it is characterised in that: institute
Stating spiral case inlet pressure between start line ha and end lines fg is helix, and what described helix included being connected with start line ha initiates
Helix ab, the end helix ef being connected with end lines fg and be connected to initial helix and terminate helix between in
Between helix, and described initial helix ab and terminate helix fg helical angle be respectively less than middle screw spin line helical angle.
2. centrifugal blower volute structure according to claim 1 it is characterised in that: described middle screw spin line at least includes
Two sections of helixes with different helical angles.
3. centrifugal blower volute structure according to claim 1 it is characterised in that: described middle screw spin line includes phase successively
Even the first helix bc, the second helix cd and the 3rd helix de, and the first helix bc are connected with initial helix ab,
3rd helix de is connected with terminating helix ef, pitch angle alpha=4.1～4.6 ° described first of described initial helix ab
Pitch angle alpha=4.07～4.81 ° of helix bc, pitch angle alpha=4.49～5.51 ° of described second helix cd, described
Pitch angle alpha=4.32～4.78 ° of three helix de, pitch angle alpha=3.6～4.05 ° of described end helix ef.
4. centrifugal blower volute structure according to claim 1 it is characterised in that: described end lines fg be straight line, this is straight
Line is with respect to inclination angle beta=8～9 ° of vertical direction.
5. the centrifugal blower volute structure according to any claim in Claims 1-4 it is characterised in that: spiral case top
Snail tongue radius of curvature r1 at plate (1) place, snail tongue (4) go deep into snail tongue radius of curvature r2 at air inlet and spiral case base plate most
(2) r1:r2:r3=1:1.2～1.4:1.6～1.8 are met between snail tongue radius of curvature r3 at place.
6. centrifugal blower volute structure according to claim 5 it is characterised in that: r1:r2:r3=1:1.3:1.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510254055.XA CN104847699B (en) | 2015-05-19 | 2015-05-19 | Centrifugal fan volute structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510254055.XA CN104847699B (en) | 2015-05-19 | 2015-05-19 | Centrifugal fan volute structure |
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| CN104847699A CN104847699A (en) | 2015-08-19 |
| CN104847699B true CN104847699B (en) | 2017-01-18 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065740B (en) * | 2019-06-11 | 2022-03-04 | 青岛海尔智能技术研发有限公司 | Centrifugal fan |
| CN111102246B (en) * | 2020-01-07 | 2022-02-08 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0369783A2 (en) * | 1988-11-16 | 1990-05-23 | Baltimore Aircoil Company, Inc. | Transition duct for centrifugal fan |
| CN101705949A (en) * | 2009-10-30 | 2010-05-12 | 美的集团有限公司 | Centrifugal fan volute of range hood |
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
| CN202673782U (en) * | 2012-07-18 | 2013-01-16 | 珠海格力电器股份有限公司 | Volute |
| CN204677503U (en) * | 2015-05-19 | 2015-09-30 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute structure |
-
2015
- 2015-05-19 CN CN201510254055.XA patent/CN104847699B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0369783A2 (en) * | 1988-11-16 | 1990-05-23 | Baltimore Aircoil Company, Inc. | Transition duct for centrifugal fan |
| CN101705949A (en) * | 2009-10-30 | 2010-05-12 | 美的集团有限公司 | Centrifugal fan volute of range hood |
| CN102182707A (en) * | 2011-05-09 | 2011-09-14 | 美的集团有限公司 | Centrifugal fan for range hood and volute profile generation method thereof |
| CN202673782U (en) * | 2012-07-18 | 2013-01-16 | 珠海格力电器股份有限公司 | Volute |
| CN204677503U (en) * | 2015-05-19 | 2015-09-30 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute structure |
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| CN104847699A (en) | 2015-08-19 |
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