CN206845545U - A kind of centrifugal blower volute - Google Patents
A kind of centrifugal blower volute Download PDFInfo
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- CN206845545U CN206845545U CN201720581803.XU CN201720581803U CN206845545U CN 206845545 U CN206845545 U CN 206845545U CN 201720581803 U CN201720581803 U CN 201720581803U CN 206845545 U CN206845545 U CN 206845545U
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- 230000003068 static effect Effects 0.000 abstract description 8
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Abstract
A kind of centrifugal blower volute, its spiral case inlet pressure include the start line AC and the end lines MN positioned at the molded line other end positioned at molded line one end, and the spiral case inlet pressure between start line AC and end lines MN is helix, it is characterised in that：The second helix DM, the first helix CD that helix includes the first helix CD being connected with start line AC and is connected with end lines MN is equiangular helical spiral, and the second helix DM is the tapered variable angle spiral of the angle of flare.The utility model has the advantage of：The centrifugal blower volute molded line by the first helix CD between start line AC and end lines MN by being designed to equiangular helical spiral, second helix DM is the tapered variable angle spiral of the angle of flare, reduce the side-to-side dimensions of spiral case, improve the fluency that spiral case internal gas flow is collected and passed through, it has been obviously improved maximum static pressure and the static pressure of effective wind rate section, realize and be issued to big spiral case effect in small size, while reduce aerodynamic noise, improve Consumer's Experience.
Description
Technical field
A kind of blower fan is the utility model is related to, more particularly, to a kind of centrifugal blower volute.
Background technology
Centrifugal blower has obtained extensive reference with the advantages that its suction is big, noise is low, compact-sized in range hood.
Spiral case is one of core component of centrifugal blower, and it is to concentrate the gas for leaving impeller that it, which is acted on, is exported to volute outlet, and will
Dynamic pressure is changed into static pressure.The volute structure of existing centrifugal blower includes spiral case top plate, spiral case bottom plate and connection spiral case top plate, spiral case
Remaining molded line in addition to snail tongue position is consistent with spiral case bottom plate for the spiral case coaming plate of bottom plate, wherein spiral case top plate.Conventional volute design one
As carried out by a metatheory, have two it is assumed that i.e. flow parameter is uniformly distributed and spiral case interior air-flow is moved on hypothesis import circumference
Moment preserving is measured, the spiral case inlet pressure by unitary Theoretical Design is usually equiangular helical spiral.But actually due to the non-axle pair of volute shape
Claim, the particularly influence of snail tongue, can form a pressure field heterogeneous in impeller outlet, impeller outlet, i.e. snail will necessarily be made
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 influence in flow field, thus the spiral case performance come out by this Theoretical Design is bad, deteriorates more especially in high back pressure working condition
Substantially, in addition, the side-to-side dimensions of this spiral case are generally bigger, product design size is influenceed.
The volute structure of various centrifugal blowers is also disclosed that in the prior art, such as Patent No. ZL 201110118687.5
Disclosed in the Chinese invention patent of (Authorization Notice No. is the B of CN 102182707)《A kind of centrifugal blower used for range hood and its
Spiral case inlet pressure generation method》, the spiral case includes spiral case top plate, spiral case bottom 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, which smoothly transits, to be formed by connecting, although after spiral case uses above-mentioned spiral case inlet pressure, being advantageous to improve centrifugal blower air quantity, wind
Pressure, efficiency simultaneously reduce aerodynamic noise, but the volute structure is again without taking into full account in spiral case circumferential plane that import circumference flows
The heterogeneity of parameter and the influence in flow field, need to be further improved
Utility model content
Technical problem to be solved in the utility model is to be directed to above-mentioned state of the art, there is provided one kind can reduce spiral case
Side-to-side dimensions simultaneously can lift maximum static pressure and the centrifugal blower volute of effective wind rate section.
Technical scheme is used by the utility model solves above-mentioned technical problem：The centrifugal blower volute, the spiral case
Spiral case inlet pressure includes the start line AC positioned at the molded line one end and end lines MN positioned at the molded line other end, and the start line AC includes
The straight line AB and the curve BC corresponding to snail tongue position of neighbouring fan outlet, the end lines MN is adjacent to fan outlet, institute
It is helix to state the spiral case inlet pressure between start line AC and end lines MN, it is characterised in that：The helix includes and start line
The first connected AC helix CD and the second helix DM, the first described helix CD being connected with end lines MN is the angle of flare
Constant equiangular helical spiral, the second described helix DM are the tapered variable angle spiral of the angle of flare.
Preferably, the polar radius R of the first helix CDCDIt is defined as：Wherein,
R2For impeller outer diameter, t is impeller excircle and the design gaps on snail tongue top, and t/R2∈ [0.01,0.15], the angle of flare α ∈
[3 °, 8 °], θ0Set for selected start angle, and θ0∈ [60 °, 180 °], θ are that the pole of arbitrfary point on the first helix CD is sat
Mark angle variables.
Further preferably, the polar radius R of the second helix DMDMIt is defined as：Its
In, R2For impeller outer diameter, t is impeller excircle and the design gaps on snail tongue top, and t/R2∈ [0.01,0.15], variable expansion
Angleα1∈[3°,8°],α2∈ [3 °, 8 °] and α1≥α2,Adjustment item s ∈ [- 0.5,0.5], r ∈ [- 5,5] and r ≠ 1, θ are the pole of arbitrfary point on the second helix DM
Coordinate angle variables, α1For the angle of flare of D points, α2For the angle of flare of M points,For the second helix DM cornerite.
Further preferably, the end lines MN includes the straightway of neighbouring air outlet and neighbouring DM curved section.
Compared with prior art, the utility model has the advantage of：Snail is considered during the centrifugal blower volute Profile Design
The even property of shell air inlet circumferential asymmetry, by by the spiral case inlet pressure between start line AC and end lines MN be designed to the first helix CD and
Second helix DM, and the first helix CD is equiangular helical spiral, the second helix DM is the tapered variable angle spiral of the angle of flare,
The side-to-side dimensions of spiral case are reduced, improve the fluency that spiral case internal gas flow is collected and passed through, hence it is evident that improve maximum static pressure
With the static pressure of effective wind rate section, realize and be issued to big spiral case effect in small size, while reduce aerodynamic noise, improve use
Experience at family.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in figure 1, the spiral case inlet pressure of the centrifugal blower volute in the present embodiment includes the start line positioned at molded line one end
The AC and end lines MN positioned at the molded line other end, wherein, start line AC includes the straight line AB of neighbouring fan outlet and corresponded to
The curve BC at snail tongue position, end lines MN is adjacent to fan outlet.
Spiral case inlet pressure between start line AC and end lines MN is helix, and the helix includes what is be connected with start line AC
First helix CD and the second helix DM, the first helix CD being connected with end lines MN is the constant equiangular spiral of the angle of flare
Line, the second described helix DM are the tapered variable angle spiral of the angle of flare.In addition, end lines MN includes the straight of neighbouring air outlet
The curved section of line segment and neighbouring DM.
In the present embodiment, the first helix CD polar radius RCDIt is defined as：Wherein, R2
For impeller outer diameter, t is impeller excircle and the design gaps on snail tongue top, and t/R2∈ [0.01,0.15], the angle of flare α ∈
[3 °, 8 °], θ0Set for selected start angle, and θ0∈ [60 °, 180 °], θ are that the pole of arbitrfary point on the first helix CD is sat
Mark angle variables.
In the present embodiment, the second helix DM polar radius RDMIt is defined as：Wherein,
R2For impeller outer diameter, t is impeller excircle and the design gaps on snail tongue top, and t/R2∈ [0.01,0.15], the variable angle of flareα1∈[3°,8°],α2∈ [3 °, 8 °] and α1≥α2,Adjustment item s ∈ [- 0.5,0.5], r ∈ [- 5,5] and r ≠ 1, θ are the pole of arbitrfary point on the second helix DM
Coordinate angle variables, α1For the angle of flare of D points, α2For the angle of flare of M points,For the second helix DM cornerite.With D points in Fig. 1
The angle of flare exemplified by, be described as follows, L1 is tangential on D points perpendicular to OD, L2 and the first helix CD, then the angle between L1 and L2
α1The as angle of flare of the spiral case inlet pressure in D points.
The even property of volute air-inlet circumferential asymmetry is considered during the spiral case inlet pressure design of the centrifugal blower volute, by by start line
Spiral case inlet pressure between AC and end lines MN is designed to the first helix CD and the second helix DM, and the first helix CD for etc.
Angle helix, the second helix DM are the tapered variable angle spiral of the angle of flare, reduce the side-to-side dimensions of spiral case, improve spiral case
Internal gas flow collects the static pressure of the fluency with passing through, larger lifting maximum static pressure and effective wind rate section, realizes in small chi
It is very little to be issued to big spiral case effect, while aerodynamic noise is reduced, improve Consumer's Experience.
It the foregoing is only preferred embodiment of the present utility model, it is noted that for those of ordinary skill in the art
For, under the premise of principle of the present utility model is not departed from, a variety of remodeling or improvement can be carried out to the utility model, these are equal
It is considered as within the scope of protection of the utility model.
Claims (4)
1. a kind of centrifugal blower volute, the spiral case inlet pressure of the spiral case is included positioned at the start line AC of molded line one end and another positioned at molded line
The end lines MN, the start line AC of one end include the straight line AB of neighbouring fan outlet and the curve corresponding to snail tongue position
The spiral case inlet pressure of BC, the end lines MN between fan outlet, the start line AC and end lines MN is helix, its
It is characterised by：The helix includes the first helix CD being connected with start line AC and the second spiral being connected with end lines MN
Line DM, the first described helix CD are the constant equiangular helical spiral of the angle of flare, the second described helix DM be the angle of flare gradually
The variable angle spiral of contracting.
2. centrifugal blower volute according to claim 1, it is characterised in that：The polar radius R of the first helix CDCDIt is fixed
Justice is：Wherein, R2For impeller outer diameter, t is between the design on impeller excircle and snail tongue top
Gap, and t/R2∈ [0.01,0.15], the angle of flare α ∈ [3 °, 8 °], θ0For the start angle of the first helix CD D points, and θ0∈
[60 °, 180 °], θ are the polar angle variable of arbitrfary point on the first helix CD.
3. centrifugal blower volute according to claim 2, it is characterised in that：The polar radius R of the second helix DMDMIt is fixed
Justice is：Wherein, R2For impeller outer diameter, t is between the design on impeller excircle and snail tongue top
Gap, and t/R2∈ [0.01,0.15], the variable angle of flareα1∈[3°,
8°],α2∈ [3 °, 8 °] and α1≥α2,Adjustment item s ∈ [- 0.5,0.5], r ∈ [- 5,5] and r ≠ 1, θ are
The polar angle variable of arbitrfary point, α on second helix DM1For the angle of flare of D points, α2For the angle of flare of M points,For second
Helix DM cornerite.
4. according to the centrifugal blower volute described in claim 1 or 2 or 3, it is characterised in that：The end lines MN include it is neighbouring go out
The curved section of the straightway in air port and neighbouring DM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581803.XU CN206845545U (en) | 2017-05-23 | 2017-05-23 | A kind of centrifugal blower volute |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720581803.XU CN206845545U (en) | 2017-05-23 | 2017-05-23 | A kind of centrifugal blower volute |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206845545U true CN206845545U (en) | 2018-01-05 |
Family
ID=60796816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720581803.XU Withdrawn - After Issue CN206845545U (en) | 2017-05-23 | 2017-05-23 | A kind of centrifugal blower volute |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206845545U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107975497A (en) * | 2017-05-23 | 2018-05-01 | 宁波方太厨具有限公司 | A kind of centrifugal blower volute |
| CN111159792A (en) * | 2020-01-07 | 2020-05-15 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
-
2017
- 2017-05-23 CN CN201720581803.XU patent/CN206845545U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111159792A (en) * | 2020-01-07 | 2020-05-15 | 宁波方太厨具有限公司 | Volute profile generation method of centrifugal fan |
| CN111159792B (en) * | 2020-01-07 | 2023-08-18 | 宁波方太厨具有限公司 | Volute molded line generation method of centrifugal fan |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180105 Effective date of abandoning: 20240402 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180105 Effective date of abandoning: 20240402 |