CN210164688U - Air duct volute of wing-shaped volute tongue - Google Patents
Air duct volute of wing-shaped volute tongue Download PDFInfo
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- CN210164688U CN210164688U CN201920873378.0U CN201920873378U CN210164688U CN 210164688 U CN210164688 U CN 210164688U CN 201920873378 U CN201920873378 U CN 201920873378U CN 210164688 U CN210164688 U CN 210164688U
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Abstract
The utility model discloses an air duct spiral case of wing section volute tongue, including volute tongue, impeller, wind channel spiral case and air outlet, the volute tongue is wing section volute tongue, wing section volute tongue by wind channel spiral case line the edge line under the wing section the edge line and diffusion straightway connect gradually and constitute, process the tangent line ab of the impeller of wing section volute tongue region is X with the contained angle of water flat line, 30X is not less than or equal to and is not less than 60, the volute tongue with the junction c point of air outlet arrives the distance of the molded lines of wind channel spiral case is 30-80mm, wing section volute tongue is confirmed by following mode: the wing tip d of the wing-shaped volute tongue is arranged on a profile line of the air duct volute, two points cd are used as arcs, the ratio of the arc height to the chord length of the arc cd is 1/20-1/5, and the wing-shaped volute tongue is formed by guiding a round angle at the two points d and c.
Description
Technical Field
The utility model belongs to the technical field of kitchen range hood and specifically relates to a wind channel spiral case of wing section spiral tongue.
Background
A tongue-shaped structure is arranged near the volute outlet of the existing centrifugal fan and is called a volute tongue, the volute tongue has the function of splitting airflow guided to the volute outlet, the flow field at the volute tongue of the air duct volute is complex, and the structural shape of the volute tongue directly influences the exhaust air quantity of the range hood, the air pressure inside the volute and the noise. When the volute tongue is in a pointed tongue shape, the radial distance from the volute tongue to the impeller is shortest, the volute is most beneficial to the air discharge amount, the air pressure in the volute and the oil smoke suction efficiency, but the noise is the largest; when the volute tongue is in a flat tongue shape, the radial distance between the volute tongue and the impeller is longest, the volute tongue is most unfavorable for the exhaust air quantity, the air pressure in the volute and the oil fume suction efficiency, but the noise is lowest.
In order to take the advantages of the two volute tongues into consideration, the volute tongue of the air duct of the existing range hood generally adopts the diffusion straight line segment to be tangent to the arc of the molded line of the volute of the air duct, as shown in fig. 1, the design is more traditional, the internal wind has flow separation, local vortex is easy to generate, a turbulent flow area is easy to generate, and the air volume and the pressure of the whole range hood are reduced.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model aims to provide a wind channel spiral case of wing section spiral tongue, the shape through the spiral tongue improves the amount of wind, reduces the air loss on the basis of making an uproar falls.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
the air duct volute of the wing-shaped volute tongue comprises a volute tongue, an impeller, an air duct volute and an air outlet, wherein the volute tongue is the wing-shaped volute tongue, the wing-shaped volute tongue is formed by sequentially connecting an air duct volute line, a wing-shaped lower edge line, a wing-shaped upper edge line and a diffusion straight line section, an included angle between a tangent line ab of the impeller passing through the wing-shaped volute tongue area and a horizontal line is X, X is more than or equal to 30 degrees and less than or equal to 60 degrees, the distance between a c point at the joint of the volute tongue and the air outlet and a molded line of the air duct volute is 30-80mm, and the wing-shaped volute tongue is determined in the following mode: the wing tip d of the wing-shaped volute tongue is arranged on a profile line of the air duct volute, two points cd are used as arcs, the ratio of the arc height to the chord length of the arc cd is 1/20-1/5, and the wing-shaped volute tongue is formed by guiding a round angle at the two points d and c.
Furthermore, when the c point of the connection part of the volute tongue and the air outlet and the d point of the wing tip of the wing-shaped volute tongue are rounded, the radius is 8-14 mm.
Further, the wing tip of the wing-shaped volute tongue is streamline.
Further, the diffusion section is a diffusion straight-line section ce, and the air outlet comprises a straight-line ventilation section and a transition curve section which is connected with the straight-line ventilation section and the straight-line diffusion section.
Further, the wing profile of the wing profile volute tongue is a symmetrical wing profile.
Further, a tangent ab of the impeller passes through the axis of symmetry of the airfoil volute tongue.
Further, the tangent ab of the impeller is at an angle of 45 ° to the horizontal.
Further, the arc height to chord length ratio of the arc cd is 1/8.
Further, the airfoil shape of the airfoil-shaped volute tongue is an asymmetric airfoil shape.
Further, the volute tongue and the air duct volute are integrally formed.
The utility model discloses a set up the wind channel spiral case of a wing section volute tongue, limit the position of wing section lower fringe line and wing section upper fringe line of wing section volute tongue through the tangent line ab of impeller and contained angle X of water flat line, simultaneously, set up the shape of wing tip of wing section volute tongue through circular arc cd; a tangent line ab of the impeller passing through a volute tongue area is the outflow direction of gas, when X is larger than 60 degrees, the expansion angle of a diffusion section of the volute tongue is small, so that the diffusion effect is poor, and when X is smaller than 30 degrees, the volute tongue is deep, so that noise concentration is easily caused; the ratio of the arc height to the chord length of the circular arc cd is 1/20-1/5, when the ratio is larger than 1/5, the expansion angle of the diffusion section of the volute tongue is large, turbulent flow is easy to generate, and the air quantity is reduced, and when the ratio is smaller than 1/20, the expansion angle of the diffusion section of the volute tongue is small, and the effect of reducing flow distribution is not obvious.
The utility model discloses among the preferred technical scheme, set up the transition curve section to the junction between diffusion straightway and the air outlet, improved the flow field of here worm tongue and diffusion straightway, reduced the striking of air current to worm tongue department, reduced air loss, improved the amount of wind, reduced the disturbed flow district of diffusion straightway rear end simultaneously, played the effect that promotes the amount of wind.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a partial enlarged view of the first embodiment of the present invention;
FIG. 4 is a second partial enlarged view of the present invention;
fig. 5 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
To clearly illustrate the design concept of the present invention, the following description is made with reference to the examples.
In the description of the present embodiment, the terms "inside", "outside", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example one
As in the example that fig. 2, fig. 3, fig. 4 show, the utility model relates to an air duct spiral case of wing section volute tongue, including volute tongue, impeller, wind channel spiral case and air outlet, the volute tongue is wing section volute tongue, wing section volute tongue by wind channel spiral case line the wing section lower fringe line the wing section upper fringe line and diffusion straightway connect gradually and constitute, the process the tangent line ab of the impeller in wing section volute tongue region is X with the contained angle of water flat line, 30 is greater than or equal to X and is less than or equal to 60, the volute tongue with the junction c point of air outlet arrives the distance of the molded lines of wind channel volute is 30-80mm, wing section volute tongue is confirmed by following mode: the wing tip d of the wing-shaped volute tongue is arranged on a profile line of the air duct volute, two points cd are used as arcs, the ratio of the arc height to the chord length of the arc cd is 1/20-1/5, and the wing-shaped volute tongue is formed by guiding a round angle at the two points d and c.
In the above example, the positions of the airfoil lower edge line and the airfoil upper edge line of the airfoil volute tongue are limited by the included angle X between the tangent ab of the impeller and the horizontal line, and the shape of the airfoil volute tongue is set by the arcs cd and fd; a tangent line ab of the impeller passing through a volute tongue area is the outflow direction of gas, when X is larger than 60 degrees, the expansion angle of a diffusion section of the volute tongue is small, so that the diffusion effect is poor, and when X is smaller than 30 degrees, the volute tongue is deep, so that noise concentration is easily caused; the ratio of the arc height to the chord length of the circular arc cd is 1/20-1/5, when the ratio is larger than 1/5, the expansion angle of the diffusion section of the volute tongue is large, turbulent flow is easy to generate, and the air quantity is reduced, and when the ratio is smaller than 1/20, the expansion angle of the diffusion section of the volute tongue is small, and the effect of reducing flow distribution is not obvious.
Example two
As in the examples shown in fig. 2, fig. 3, fig. 4, the utility model relates to an air duct spiral case of wing section volute tongue, including volute tongue 3, air duct spiral case 2 and air outlet 4, volute tongue 3 is wing section volute tongue, and wing section volute tongue is by air duct spiral case line the wing section lower fringe line, wing section upper fringe line and diffusion straightway connect gradually and constitute, process the tangent line ab of the regional impeller 1 of wing section volute tongue is X with the contained angle of water flat line, X is 45 °, volute tongue 3 with the junction c point of air outlet 4 arrives the distance of the molded lines of air duct spiral case 2 is 30-80mm, wing section volute tongue is confirmed by following mode: the wing tip d of the wing-shaped volute tongue is arranged on the profile line of the air duct volute 2, two points cd are used as arcs, the ratio of the arc height to the chord length of the arc cd is 1/20-1/5, and the wing-shaped volute tongue is formed by guiding a round angle at the two points d and c;
in this embodiment, the ratio of the arc height to the chord length of the arc cd is 1/8, and when the fillet is rounded at the point c of the connection between the volute tongue 3 and the air outlet 4 and the point d of the wing tip of the wing-shaped volute tongue, the radius of the circle is 14 mm.
Referring to fig. 4, the diffuser section is a diffuser straight-line section ce, the diffuser straight-line section is connected with the air outlet of the air duct volute 2 at a point c, and the vent includes a straight-line ventilation section and a transition curve section connecting the straight-line ventilation section and the straight-line diffuser section.
In the above example, the transition curve section is arranged at the connection between the diffusion straight-line section and the air outlet, and the flow fields of the volute tongue 3 and the diffusion straight-line section are improved, so that the impact of air flow on the volute tongue is reduced, the air flow loss is reduced, the air quantity is increased, the turbulent flow area at the rear end of the diffusion straight-line section is reduced, and the air quantity increasing effect is achieved.
As shown in fig. 2, the airfoil of the airfoil volute tongue is a symmetrical airfoil, the airfoil tip is streamline, a tangent ab of the impeller 1 in the air duct volute 2 passes through a symmetrical axis of the airfoil volute tongue, and the airfoil volute tongue and the air duct volute 2 are integrally formed.
In the above example, the wing profile has the characteristics of good flow dividing effect, small air volume impact, less loss and difficult separation of flow, and the wing tip is streamlined and can link the impact of airflow on the volute tongue, so that the noise is reduced. Meanwhile, the included angle X between the axis of the wing-shaped volute tongue and the horizontal line is 45 degrees, so that the phase of the pulse airflow acting on the volute tongue is staggered, the pulse force on the volute tongue is reduced, and the effect of reducing noise is achieved. As shown in fig. 2, in the present embodiment, the distance between the volute tongue 3 and the impeller 1 is the smallest in the distance between the profile of the air duct volute 2 and the impeller 1, and after oil smoke passes through the wing-shaped volute tongue, the path is enlarged, the resistance is reduced, and the noise generated by the oil smoke flowing in the air duct is effectively reduced.
EXAMPLE III
The other parts of the present embodiment are the same as the above embodiments, except that the airfoil of the airfoil volute tongue is an asymmetric airfoil, and the tip of the airfoil is streamline and simultaneously bends towards the impeller direction, see fig. 5.
It is noted that some of the structures may be selected differently than the specific examples given above. These are all made by those skilled in the art based on their basic skills based on understanding the idea of the present invention, and are not illustrated herein.
Finally, it is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications are to be considered as the protection scope of the invention.
Claims (10)
1. The air duct volute of the wing-shaped volute tongue is characterized by comprising the volute tongue, an air duct volute and an air outlet, wherein the volute tongue is the wing-shaped volute tongue, the wing-shaped volute tongue is formed by sequentially connecting an air duct volute molded line, a wing-shaped lower edge line, a wing-shaped upper edge line and a diffusion section, an included angle between a tangent ab of an impeller passing through the wing-shaped volute tongue area and a horizontal line is X, X is more than or equal to 30 degrees and less than or equal to 60 degrees, the distance between a c point at the joint of the volute tongue and the air outlet and the molded line of the air duct volute is 30-80mm, and the wing-shaped volute tongue is determined in the following mode: the wing tip d of the wing-shaped volute tongue is arranged on a profile line of the air duct volute, two points cd are used as arcs, the ratio of the arc height to the chord length of the arc cd is 1/20-1/5, and the wing-shaped volute tongue is formed by guiding a round angle at the two points d and c.
2. The air duct volute of the airfoil volute tongue as claimed in claim 1, wherein the radius of the point c at the connection between the volute tongue and the air outlet and the point d at the wing tip of the airfoil volute tongue is 8-14mm when the points are rounded.
3. The duct volute of an airfoil volute tongue as claimed in claim 1, wherein the wing tip of the airfoil volute tongue is streamlined.
4. The air duct volute of an airfoil volute tongue as claimed in claim 1, wherein the diffuser is a diffuser straight section ce, and the outlet includes a straight ventilation section and a transition curve section connecting the straight ventilation section and the diffuser straight section.
5. The duct volute of the airfoil volute tongue as claimed in claim 1, wherein the airfoil of the airfoil volute tongue is a symmetrical airfoil.
6. The duct volute of an airfoil volute tongue as claimed in claim 5, wherein a tangent ab of the impeller passes through an axis of symmetry of the airfoil volute tongue.
7. The duct volute of an airfoil volute of claim 1, wherein the angle between the tangent ab to the impeller and the horizontal is 45 °.
8. The duct volute of the airfoil volute tongue of claim 1, wherein the arc cd has a camber to chord ratio of 1/8.
9. The duct volute of an airfoil volute tongue as defined in claim 1, wherein the airfoil of the airfoil volute tongue is an asymmetric airfoil.
10. The duct volute of an airfoil volute tongue as defined in claim 1, wherein the volute tongue is integrally formed with the duct volute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920873378.0U CN210164688U (en) | 2019-06-12 | 2019-06-12 | Air duct volute of wing-shaped volute tongue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920873378.0U CN210164688U (en) | 2019-06-12 | 2019-06-12 | Air duct volute of wing-shaped volute tongue |
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| Publication Number | Publication Date |
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| CN210164688U true CN210164688U (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920873378.0U Active CN210164688U (en) | 2019-06-12 | 2019-06-12 | Air duct volute of wing-shaped volute tongue |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022088222A1 (en) * | 2020-11-02 | 2022-05-05 | 宁波方太厨具有限公司 | Parallel-connected double-fan system, and range hood applying same |
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2019
- 2019-06-12 CN CN201920873378.0U patent/CN210164688U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022088222A1 (en) * | 2020-11-02 | 2022-05-05 | 宁波方太厨具有限公司 | Parallel-connected double-fan system, and range hood applying same |
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