CN207080415U - A kind of radial fan snail tongue structure - Google Patents
A kind of radial fan snail tongue structure Download PDFInfo
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- CN207080415U CN207080415U CN201721111373.1U CN201721111373U CN207080415U CN 207080415 U CN207080415 U CN 207080415U CN 201721111373 U CN201721111373 U CN 201721111373U CN 207080415 U CN207080415 U CN 207080415U
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- snail tongue
- tongue
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- snail
- radial fan
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Abstract
The utility model discloses a kind of radial fan snail tongue structure, including main snail tongue, the lip of the tongue of the main snail tongue forms the male part to air-flow side evagination, it is characterised in that：Downwardly projecting secondary snail tongue is provided with the front side bottom of the main snail tongue, downwardly projecting secondary snail tongue is provided with the bottom rear of the main snail tongue.The utility model has the advantage of：The lip of the tongue of the main snail tongue of the snail tongue structure forms the male part to air-flow side evagination, downwardly projecting secondary snail tongue is equipped with the front side bottom of main snail tongue and bottom rear, while change R snail tongues are retained using phase difference reduction gas shock reduction noise, Second Interception is carried out by increasing the secondary snail tongue of rear and front end, to reduce backflow, lifting static pressure, so as to further lift the operating efficiency of radial fan.
Description
Technical field
A kind of snail tongue is the utility model is related to, more particularly, to a kind of radial fan snail tongue structure.
Background technology
Main function for the blower fan snail tongue of range hood is to dam and (prevent impeller from driving air-flow idle running without going out),
In general snail tongue can be divided into sharp tongue, deep tongue, short tongue, flat tongue, and for traditional straight snail tongue, snail tongue is deeper, and it is with impeller
Gap is smaller, and efficiency improves, but noise increases.During the flowing velocity of spiral case interior air-flow is substantially along axis direction distribution
Between flow velocity it is big, the small conic section distribution of both ends flow velocity, understood from the result of fluid emulation analysis, fan outlet it is neighbouring due to
Midrange speed is big, and both ends speed is small, thus has the Secondary Flow among obvious toward left and right sides flowing to form Maelstrom, this existing
As the generally existing in traditional straight snail tongue blower fan.
In order to reduce fan noise and eliminate whirlpool, people are improved the structure of snail tongue, such as Application No.
Disclosed in 201110427490.X (application publication number is the A of CN 102518603) Chinese invention patent application《Lampblack absorber wind
Machine and the lampblack absorber for being provided with the blower fan》, its by forming the recess to snail row shell outer concave in the snail tongue portion of snail row shell, so as to
From the point of view of on the direction of air outlet, recess is arc, although, by setting recess to carry out rectification to air-flow herein, so as to
In noise caused by snail tongue portion place when reducing lampblack absorber work, but the lower surface of the snail tongue and the gap length phase of impeller
Together, thus, easily produce whirlpool in the front and rear sides of snail tongue during blower fan work.
The and for example Chinese invention patent of Patent No. 201310742965.3 (Authorization Notice No. is the B of CN 103742453)
Disclosed《A kind of range hood centrifugal fan with double air inlet structures》, the snail tongue of the centrifugal blower has towards remote with
Between housing junction direction protrusion snail tongue face, snail tongue face include be connected smoothly it is asymmetric lean forward skew surface and after
Curved surface is tilted, also, is the most evagination in snail tongue face at two intersections for tilting curved surface.Although the centrifugal blower is using two-way
Inclined snail tongue, it is tilted the Velocity Profiles that the distribution of curved surface meets double intake air impellers, make noise caused by snail tongue
A part of noise is more effectively offset in source, improves noise reduction capability, but the actual gap increase of snail tongue front and rear sides so that maximum quiet
The pressure of pressure and actual user's state has declined.
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 gas
What noise that stream impact is brought, and can carried out Second Interception to lift static pressure is used for radial fan snail tongue structure
Technical scheme is used by the utility model solves above-mentioned technical problem：The radial fan snail tongue structure, including
Main snail tongue, the lip of the tongue of the main snail tongue form the male part to air-flow side evagination, it is characterised in that：Before the main snail tongue
Side bottom is provided with downwardly projecting secondary snail tongue, and downwardly projecting secondary snail tongue is provided with the bottom rear of the main snail tongue.
Preferably, the main snail tongue has a front end face and rear end face, and the secondary snail tongue of bottom is from the front end on front side of main snail tongue
Face is extended back, and the secondary snail tongue of main snail tongue bottom rear extends forward from the rear end, and two secondary snail tongues are oppositely arranged and respectively
From extension between leave gap.
In order to lift the Second Interception effect of secondary snail tongue, it is preferable that positioned at the front end of the secondary snail tongue of bottom on front side of main snail tongue
Section has arc section and the straightway extended from arc section to root of the tongue direction, after the secondary snail tongue of main snail tongue bottom rear
End section has arc section and the straightway extended from arc section to root of the tongue direction.
In order to further lift the Second Interception effect of secondary snail tongue, the radius r of the arc section and the impeller basis of blower fan
Ratio range between radius of circle R1 is 0.01 ＜ r/R1 ＜ 0.08.
In order to further improve the Second Interception effect of secondary snail tongue, between the secondary snail tongue and the impeller basis circle of blower fan
Gap be t1, then t1 and impeller basis circle radius R1 between ratio range be 0.05 ＜ t1/R1 ＜ 0.13.
Further preferably, the front end of the main snail tongue and the gap of impeller basis circle and rear end and the impeller base of main snail tongue
The gap of plinth circle is t2, then t1 ＜ t2.
Further preferably, the line between the minimum point of the secondary snail tongue and draught fan impeller center is relative to impeller meridian plane
Deflection angle α span be 0 ° of 40 ° of ＜ α ＜.
In order that snail tongue preferably can be engaged with single air intake radial fan of advancing air, the male part is located at main snail tongue
The position of middle side rearward.
In order that snail tongue structure is more succinct, firmly, described main snail tongue and secondary snail tongue are formed in one part.
Further preferably, the front-end and back-end of the main snail tongue are respectively formed R corner structures.
Compared with prior art, the utility model has the advantage of：The tip of the tongue of the main snail tongue of the radial fan snail tongue structure
Portion forms the male part to air-flow side evagination, and downwardly projecting secondary snail is equipped with the front side bottom of main snail tongue and bottom rear
Tongue, while change R snail tongues are retained using phase difference reduction gas shock reduction noise, by the secondary snail tongue for increasing rear and front end
To carry out Second Interception, to reduce backflow, lifting static pressure, so as to further lift the operating efficiency of radial fan.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model embodiment；
Fig. 2 is the structural representation of another angle of snail tongue shown in Fig. 1；
Fig. 3 is the position relationship schematic diagram between the snail tongue of the utility model embodiment and impeller；
Fig. 4 is the snail tongue mounting structure schematic diagram of the utility model embodiment.
Fig. 5 is the schematic diagram of another angle of mounting structure shown in Fig. 4.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing embodiment.
As shown in Figure 1 to Figure 3, the radial fan snail tongue structure in the present embodiment includes main snail tongue 1 and secondary snail tongue 2.With Fig. 1
Direction shown in arrow A is to be preceding to main snail tongue 1 has front end face 12 and rear end face 13, and the front-end and back-end of main snail tongue 1 are respectively formed R
Corner structure, the lip of the tongue of main snail tongue 1 form the male part 11 to air-flow side evagination.The front side bottom of main snail tongue 1 and bottom rear
Downwardly projecting and form secondary snail tongue 2, the secondary snail tongue 2 of the main front side bottom of snail tongue 1 extends back from front end face 12, the main rear side of snail tongue 1
The secondary snail tongue 2 of bottom extends forward from rear end face 13, and two secondary structures of snail tongue 2 are identical and are oppositely arranged, and two secondary snail tongues 2 are each
From extension between leave gap.In order that snail tongue structure is more succinct, firm, and in the present embodiment, secondary snail tongue 2 and main snail
Tongue 1 is formed in one part.
In the present embodiment, in order that secondary snail tongue 2 can carry out effective Second Interception, the secondary snail positioned at the main front side bottom of snail tongue 1
The front elevational sectional of tongue 2 has arc section 21 and the straightway 22 extended from arc section to root of the tongue direction, positioned at the main rear side bottom of snail tongue 1
The rear end section of the secondary snail tongue 2 in portion has arc section 21 and the straightway 22 extended from arc section to root of the tongue direction.Also, circular arc
Ratio range between radius r and impeller the basis 3 radius R1 of circle of section 21 is 0.01 ＜ r/R1 ＜ 0.08.
Gap between secondary snail tongue 2 and impeller basis circle 3 is t1, and clearance t 1 is the secondary minimum point of snail tongue 2 and impeller basis
Vertical range between circle 3, front end and the gap of impeller basis circle 3 and the rear end of main snail tongue 1 and impeller basis of main snail tongue 1
The gap of circle 3 is t2, clearance t 2 be for the front end face 12 of main snail tongue 1 and the minimum point of rear end face 13 and impeller basis circle 3 it
Between vertical range, t1 ＜ t2 need to be met.Also, the ratio range between the radius R1 of t1 and impeller basis circle 3 meets 0.05
＜ t1/R1 ＜ 0.13.
In addition, in the present embodiment, the line 4 between the minimum point of secondary snail tongue 2 and draught fan impeller center is relative to impeller
The noon deflection angle α span in face 5 is 0 ° of 40 ° of ＜ α ＜, also, between the minimum point of secondary snail tongue 2 and draught fan impeller center
Arc section 21 of the line 4 Jing Guo secondary snail tongue 2 the center of circle.
In order to coordinate single air intake radial fan of front side air intake, the male part 11 of main snail tongue 1 is located among main snail tongue 1
The position of side rearward.
As shown in Figure 4 and Figure 5, the snail tongue is arranged on spiral case 6, by setting secondary snail tongue 2 to solve because before and after spiral case 6
Cover plate nearby snail tongue retreat caused by gap increase and bring leakage rate increase the problem of, using secondary snail tongue 2 reduce gap come
Second Interception is carried out, lifts actual blast and efficiency.
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 (9)
1. a kind of radial fan snail tongue structure, including main snail tongue (1), the lip of the tongue of the main snail tongue (1) is formed to outside air-flow side
Convex male part (11), it is characterised in that：Downwardly projecting secondary snail tongue (2) is provided with the front side bottom of the main snail tongue (1),
The bottom rear of the main snail tongue (1) is provided with downwardly projecting secondary snail tongue (2).
2. radial fan snail tongue structure according to claim 1, it is characterised in that：The main snail tongue (1) has front end face
(12) extended back with rear end face (13), the secondary snail tongue (2) of main snail tongue (1) front side bottom from the front end face (12), main snail tongue
The secondary snail tongue (2) of bottom rear extends forward from the rear end face (13), and two secondary snail tongues (2) are oppositely arranged and respective extension
Gap is left between part.
3. radial fan snail tongue structure according to claim 1, it is characterised in that：Positioned at bottom on front side of main snail tongue (1)
The straightway (22) that the front elevational sectional of secondary snail tongue (2) has arc section (21) and extended from arc section to root of the tongue direction, positioned at master
The rear end section of the secondary snail tongue (2) of snail tongue (1) bottom rear has an arc section (21) and extended from arc section to root of the tongue direction
Straightway (22).
4. radial fan snail tongue structure according to claim 3, it is characterised in that：The radius r of the arc section (21) with
Ratio range between impeller basis circle (3) radius R1 of blower fan is 0.01 ＜ r/R1 ＜ 0.08.
5. radial fan snail tongue structure according to claim 1, it is characterised in that：The secondary snail tongue (2) and the leaf of blower fan
Gap between wheel basis circle (3) is that the ratio range between the radius R1 of t1, then t1 and impeller basis circle (3) is 0.05 ＜
T1/R1 ＜ 0.13.
6. radial fan snail tongue structure according to claim 5, it is characterised in that：The front end of the main snail tongue (1) and leaf
The gap of wheel basis circle (3) and the rear end of main snail tongue (1) and the gap of impeller basis circle (3) are t2, then t1 ＜ t2.
7. radial fan snail tongue structure according to claim 1, it is characterised in that：The minimum point of the secondary snail tongue (2) with
Line (4) between draught fan impeller center is 0 ° of ＜ α ＜ relative to the deflection angle α of impeller meridian plane (5) span
40°。
8. radial fan snail tongue structure according to claim 1, it is characterised in that：The male part (11) is located at main snail tongue
(1) position of middle side rearward.
9. the radial fan snail tongue structure according to any claim in claim 1 to 8, it is characterised in that：Described
Main snail tongue (1) and secondary snail tongue (2) are formed in one part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111373.1U CN207080415U (en) | 2017-08-31 | 2017-08-31 | A kind of radial fan snail tongue structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721111373.1U CN207080415U (en) | 2017-08-31 | 2017-08-31 | A kind of radial fan snail tongue structure |
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| Publication Number | Publication Date |
|---|---|
| CN207080415U true CN207080415U (en) | 2018-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721111373.1U Active CN207080415U (en) | 2017-08-31 | 2017-08-31 | A kind of radial fan snail tongue structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109424585A (en) * | 2017-08-31 | 2019-03-05 | 宁波方太厨具有限公司 | A kind of radial fan volute tongue structure |
| CN110159591A (en) * | 2019-05-30 | 2019-08-23 | 宁波方太厨具有限公司 | A kind of volute tongue structure and application have the centrifugal blower of the volute tongue structure |
| CN110374934A (en) * | 2019-08-02 | 2019-10-25 | 马鞍山宸宇达风机工业有限公司 | The installation method of blower volute tongue |
-
2017
- 2017-08-31 CN CN201721111373.1U patent/CN207080415U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109424585A (en) * | 2017-08-31 | 2019-03-05 | 宁波方太厨具有限公司 | A kind of radial fan volute tongue structure |
| CN109424585B (en) * | 2017-08-31 | 2024-01-16 | 宁波方太厨具有限公司 | Runoff fan volute tongue structure |
| CN110159591A (en) * | 2019-05-30 | 2019-08-23 | 宁波方太厨具有限公司 | A kind of volute tongue structure and application have the centrifugal blower of the volute tongue structure |
| CN110159591B (en) * | 2019-05-30 | 2020-10-27 | 宁波方太厨具有限公司 | Volute tongue structure and centrifugal fan applying same |
| CN110374934A (en) * | 2019-08-02 | 2019-10-25 | 马鞍山宸宇达风机工业有限公司 | The installation method of blower volute tongue |
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