CN214998451U - Centrifugal fan volute structure of range hood - Google Patents
Centrifugal fan volute structure of range hood Download PDFInfo
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- CN214998451U CN214998451U CN202120095978.6U CN202120095978U CN214998451U CN 214998451 U CN214998451 U CN 214998451U CN 202120095978 U CN202120095978 U CN 202120095978U CN 214998451 U CN214998451 U CN 214998451U
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- 230000007704 transition Effects 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model discloses a range hood's centrifugal fan spiral case structure, the edge profile line of spiral case panel is continuous the formation by sharp AB, curve BC, pitch arc CD and sharp DE at its planar projection line of place to be rounding off between sharp AB, curve BC, pitch arc CD and the sharp DE and connect, the spiral case molded lines are by spline curve that a plurality of points rounding off formed or by this curve scaling and forming, so in order to carry out optimal design to the spiral case molded lines. The volute has a simple structure, and the molded line of the volute is optimally designed, so that the outlet airflow at the periphery of the impeller and the air in the volute flow more uniformly.
Description
Technical Field
The utility model relates to a kitchen electricity technical field especially relates to a centrifugal fan spiral case structure of range hood.
Background
The range hood is one of the kitchen household appliances indispensable to the family. In the related technology, most of the top-suction cigarette machines occupy larger and larger shares in domestic markets by the advantages of being hidden in cabinets, concise in appearance, easy to manage, uniform in negative pressure distribution, good in smoking effect and the like. The fan mounting mode is in straight row, and the air inlet of fan below is bigger, the structure is compacter, advantage such as easy cleanness receives consumer's favor more. However, the size of the volute of the fan is required to be as small as possible due to the influence of the installation space of the whole machine and the space limitation of the box body of the range hood, and a front and back double air inlet structure is generally adopted.
Disclosure of Invention
The utility model discloses aim at solving one of the problems that exist among the prior art to a certain extent at least, for this reason, the utility model provides a range hood's centrifugal fan spiral case structure, its simple structure through carrying out optimal design to the spiral case molded lines to the flow of air is more even in making impeller border export air current and the spiral case.
The above purpose is realized by the following technical scheme:
the utility model provides a range hood's centrifugal fan spiral case structure, has the spiral case body, the spiral case body includes the spiral case panel, the edge profile line of spiral case panel is continuous by sharp AB, curve BC, pitch arc CD and the straight line DE of rounding off in proper order at the projection line of its place plane and is formed, and, straight line AB with curve BC is tangent in point B, curve BC with pitch arc CD is tangent in point C, pitch arc CD with straight line DE is tangent in point D, curve BC is by the spline curve that a plurality of point rounding off formed or by spline curve scaling down or enlargeing obtain such as.
In some embodiments, the curve BC is a spline curve formed by rounding off 21 points in the following table or is scaled down or enlarged from the spline curve:
| angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of |
| -8° | 188.3 | 75° | 168.9 | 165° | 168.2 | 255° | 138.9 |
| 0° | 186.7 | 90° | 165.0 | 180° | 147.9 | 270° | 137.9 |
| 15° | 183.6 | 105° | 161.1 | 195° | 145.4 | 281° | 137.1 |
| 30° | 180.3 | 120° | 157.4 | 210° | 143.3 | ||
| 45° | 176.6 | 135° | 153.9 | 225° | 141.5 | ||
| 60° | 172.8 | 150° | 150.7 | 240° | 140.1 |
。
In some embodiments, the radius of the arc CD is equal to or greater than 2 and equal to or less than 10.
In some embodiments, the angle between the line AB and the line DE is greater than or equal to 0 ° and less than or equal to 10 °.
In some embodiments, a ratio between a width of the volute body air outlet and an opening degree of the volute body is greater than or equal to 1.8 and less than or equal to 3.
In some embodiments, the scroll casing further comprises a scroll casing bottom plate and a scroll casing enclosing plate, wherein the scroll casing enclosing plate is arranged at a position between the scroll casing panel and the scroll casing bottom plate, and a projection line of a plane where the edge profile of the scroll casing bottom plate is located and a projection line of a plane where the edge profile of the scroll casing panel is located are correspondingly arranged in an overlapping manner.
In some embodiments, a volute flange is also included, the volute flange being disposed at a location of the volute body air outlet.
In some embodiments, a first air inlet is formed in the volute panel, a motor fixing hole and a second air inlet are formed in the volute bottom plate, and the center of the first air inlet coincides with the center of the motor fixing hole.
In some embodiments, the volute enclosure is a straight symmetrical structure at the volute tongue of the volute body.
In some embodiments, the volute body has a continuous smooth transition twisted surface at the volute tongue.
Compared with the prior art, the utility model discloses an at least including following beneficial effect:
1. the utility model discloses range hood's centrifugal fan spiral case, its simple structure is through carrying out optimal design to the spiral case molded lines to the flow of air is more even in outlet air current and the spiral case around making the impeller.
2. The range hood has reasonable design, can effectively increase the wind pressure of the fan and improve the wind quantity of the fan, thereby reducing the eddy noise and simultaneously ensuring the smoke exhaust smoothness of the range hood.
Drawings
Fig. 1 is a schematic structural diagram of a volute in an embodiment of the present invention;
FIG. 2 is a schematic front view of a volute in an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a volute in an embodiment of the present invention;
fig. 4 is a schematic projection line of the edge profile of the volute panel on the plane in the embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the scope of the claimed technical solution of the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 4, the present embodiment provides a centrifugal fan volute structure of a range hood, which includes a volute body 5, the volute body 5 includes a volute panel 1, a projection line of an edge contour line of the volute panel 1 on a plane thereof is formed by connecting a straight line AB, a curve BC, an arc CD and a straight line DE, which are smoothly transitioned in sequence, and the straight line AB and the curve BC are tangent to a point B, the curve BC and the arc CD are tangent to a point C, the arc CD and the straight line DE are tangent to a point D, and the curve BC is a spline curve formed by smooth transition of a plurality of points or is obtained by reducing or amplifying the spline curve in equal proportion.
In this embodiment, the projection line of the edge contour line of the volute panel 1 on the plane where the edge contour line is located is formed by connecting a straight line AB, a curve BC, an arc CD and a straight line DE, and the straight line AB, the curve BC, the arc CD and the straight line DE are all in smooth transition connection, and the volute profile line is a spline curve formed by smooth transition of a plurality of points or is formed by scaling the curve in equal proportion, so as to optimize the volute profile line, and the volute profile line is simple in structure, and through optimizing the volute profile line, the outlet airflow of the impeller periphery and the flow of the air in the volute are more uniform.
Further, the curve BC is a spline curve formed by rounding off 21 points in the following table or is obtained by scaling down or enlarging the spline curve:
| angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of | Angle of rotation | Radius of |
| -8° | 188.3 | 75° | 168.9 | 165° | 168.2 | 255° | 138.9 |
| 0° | 186.7 | 90° | 165.0 | 180° | 147.9 | 270° | 137.9 |
| 15° | 183.6 | 105° | 161.1 | 195° | 145.4 | 281° | 137.1 |
| 30° | 180.3 | 120° | 157.4 | 210° | 143.3 | ||
| 45° | 176.6 | 135° | 153.9 | 225° | 141.5 | ||
| 60° | 172.8 | 150° | 150.7 | 240° | 140.1 |
。
In this embodiment, the volute panel 1 has the first air inlet 11, and 21 points in the above table are formed by using a center of a circle of the first air inlet 11 on the volute panel 1 as a coordinate origin, an X coordinate axis is a horizontal direction, a Y coordinate axis is a vertical direction, a central angle formed by clockwise rotation of the X-axis positive half shaft around the coordinate origin is a positive angle, and a central angle formed by counterclockwise rotation of the X-axis positive half shaft around the coordinate origin is a negative angle.
Preferably, the radius of the arc line CD is more than or equal to 2 and less than or equal to 10, and the design is reasonable and ingenious.
Further, the included angle between the straight line AB and the straight line DE is more than or equal to 0 degrees, and less than or equal to 10 degrees, the structure is simple, the molded line included angle between the volute panel 1 and the volute bottom plate 2 at the air outlet is small, and therefore the air pressure is increased, and the smoothness of smoke discharge is guaranteed.
Specifically, the ratio between the width of the air outlet of the volute body 5 and the opening degree of the volute body 5 is greater than or equal to 1.8, and less than or equal to 3, the design is reasonable, and the air volume of the fan can be effectively increased.
Further, the volute casing structure further comprises a volute casing bottom plate 2 and a volute casing enclosing plate 3, wherein the volute casing enclosing plate 3 is arranged at the middle position of the volute casing panel 1 and the volute casing bottom plate 2, the projection line of the plane where the edge outline of the volute casing bottom plate 2 is located and the projection line of the plane where the edge outline of the volute casing panel 1 is located are correspondingly overlapped, the structure is simple, the design is reasonable, and the projection lines of the planes where the volute casing panel 1 and the volute casing bottom plate 2 are located are the same.
Preferably, still include volute flange 4, volute flange 4 sets up in the position department of 5 air outlets of volute body, and its simple structure can do benefit to the dismouting between volute and the outside pipeline.
Specifically, a first air inlet 11 is formed in the volute panel 1, a motor fixing hole 21 and a second air inlet 22 are formed in the volute bottom plate 2, the circle center of the first air inlet 11 is overlapped with the circle center of the motor fixing hole 21, and the volute is reasonable and ingenious in design.
Furthermore, the volute casing enclosing plate 3 is of a straight symmetrical structure at the volute tongue of the volute casing body 5, and the structure is simple.
Particularly, the volute tongue of the volute body 5 is a twisted surface with continuous smooth transition, and the volute is simple in structure and reasonable in design.
In this embodiment, a first air inlet 11 is disposed at the center of the front surface of the volute panel 1 to allow the oil smoke entering the range hood to flow into the volute through the first air inlet 11, a motor fixing hole 21 is disposed on the volute bottom plate 2 for fixing and installing a motor, a second air inlet 22 is disposed at the circumferential position of the motor fixing hole 21 on the volute bottom plate 2, the volute is adapted to a case with a relatively compact size by using front and rear air inlets, which is favorable for more uniform flow of air flow, and the center of the first air inlet 11 coincides with the center of the motor fixing hole 21, and meanwhile, the tangential point BCD of the projection line of the edge profile of the volute panel 1 on the plane corresponds to the tangential point of the projection line of the volute bottom plate 2 on the plane, and the radius of the arc DE of the projection line of the edge profile of the volute panel 1 on the plane is R, wherein R satisfies the following condition: r is more than or equal to 2 and less than or equal to 10, the radius of the arc line DE is the same as the radius of the arc line of the projection line of the plane where the edge contour line of the volute bottom plate 2 is located, in addition, the included angle between the straight line AB and the straight line ED of the projection line of the plane where the edge contour line of the volute panel 1 is located is theta, and the theta meets the following conditions: theta is more than or equal to 0 degree and less than or equal to 10 degrees, in addition, the ratio of the width m of the air outlet of the volute body 5 to the opening degree n of the volute body 5 is m/n, and the ratio of the width m to the opening degree n of the volute body 5 meets the following conditions: m/n is more than or equal to 1.8 and less than or equal to 3.0, and the ratio of the general volute in the prior art is 1.2 to 1.8.
In this embodiment, the volute casing surrounding plate 3 is of a straight symmetrical structure at the volute tongue of the volute casing body 5, that is, the volute tongue of the volute casing 5 is symmetrically arranged along the center line of the surrounding plate, that is, the straight line DE is of a planar structure, so that the volute tongue of the volute casing body 5 is of a straight symmetrical structure, meanwhile, the volute tongue of the volute casing body 5 is of a twisted surface with continuous smooth transition, that is, one end of an arc CD is in smooth transition connection with a curve BC, and the other end of the arc CD is in smooth transition connection with the straight line DE, in addition, the volute panel 1 and the volute bottom plate 2 are respectively arranged at two sides of the volute casing surrounding plate 3, and then the volute casing surrounding plate 3, the volute bottom plate 2 and the volute panel 1 are assembled together through welding connection, and the volute flange 4 is arranged at the air outlet of the volute casing body 5, and the volute flange 4 is also preferably welded and assembled on the volute casing surrounding plate 3, so that the volute casing surrounding plate 3, the volute flange 3, and the volute bottom plate 1 are effectively improved, The stability of the assembly between the volute bottom plate 2 and the volute panel 1.
In this embodiment, the actually measured air volume of the existing common blower is about 16m3The actual measurement sound pressure level noise is about 54dB, the following data can be obtained through a large number of experiments after the volute molded lines are optimally designed, and the actual measurement air volume is 17m by adopting the centrifugal fan of the volute in the embodiment3And at the same time, the volume of the range hood of which the partial width is less than 700mm is further reduced by adopting the centrifugal fan of the volute in the embodiment, and meanwhile, the effect of smoke suction and discharge can be effectively kept.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (10)
1. The utility model provides a range hood's centrifugal fan spiral case structure, has spiral case body (5), spiral case body (5) are including spiral case panel (1), its characterized in that, the projection line of the edge profile line of spiral case panel (1) at its place plane is formed by continuous straight line AB, curve BC, pitch arc CD and the straight line DE of rounding off in proper order to, and straight line AB is tangent in B point with curve BC, and curve BC is tangent in C point with pitch arc CD, and pitch arc CD is tangent in D point with straight line DE, curve BC is by the spline curve that a plurality of point rounding off formed or by the spline curve scaling down or enlargeing obtain.
2. The centrifugal fan volute structure of the range hood according to claim 1, wherein the curve BC is a spline curve formed by smooth transitions of 21 points in the following table or is obtained by scaling down or enlarging the spline curve:
。
3. The volute structure of the centrifugal fan of the range hood according to claim 1, wherein a radius of the arc CD is greater than or equal to 2 and less than or equal to 10.
4. The volute structure of the centrifugal fan of the range hood according to claim 1, wherein an included angle between the straight line AB and the straight line DE is greater than or equal to 0 ° and less than or equal to 10 °.
5. The centrifugal fan volute structure of the range hood according to claim 1, wherein a ratio between a width of the air outlet of the volute body (5) and an opening degree of the volute body (5) is greater than or equal to 1.8 and less than or equal to 3.
6. The centrifugal fan volute structure of the range hood according to claim 1, further comprising a volute bottom plate (2) and a volute enclosing plate (3), wherein the volute enclosing plate (3) is disposed at a middle position between the volute panel (1) and the volute bottom plate (2), and a projection line of a plane where an edge profile of the volute bottom plate (2) is located and a projection line of a plane where an edge profile of the volute panel (1) is located are correspondingly overlapped.
7. The centrifugal fan volute structure of the range hood according to claim 6, further comprising a volute flange (4), wherein the volute flange (4) is disposed at an air outlet of the volute body (5).
8. The centrifugal fan volute structure of the range hood according to claim 6, wherein a first air inlet (11) is formed in the volute panel (1), a motor fixing hole (21) and a second air inlet (22) are respectively formed in the volute bottom plate (2), and a circle center of the first air inlet (11) and a circle center of the motor fixing hole (21) are arranged in a superposition manner.
9. The centrifugal fan volute structure of the range hood according to claim 6, wherein the volute coaming (3) is of a straight symmetrical structure at the volute tongue of the volute body (5).
10. The centrifugal fan volute structure of the range hood according to any one of claims 1 to 9, wherein the volute tongue of the volute body (5) is a continuously and smoothly transitioned twisted surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120095978.6U CN214998451U (en) | 2021-01-14 | 2021-01-14 | Centrifugal fan volute structure of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120095978.6U CN214998451U (en) | 2021-01-14 | 2021-01-14 | Centrifugal fan volute structure of range hood |
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| Publication Number | Publication Date |
|---|---|
| CN214998451U true CN214998451U (en) | 2021-12-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120095978.6U Active CN214998451U (en) | 2021-01-14 | 2021-01-14 | Centrifugal fan volute structure of range hood |
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| CN (1) | CN214998451U (en) |
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- 2021-01-14 CN CN202120095978.6U patent/CN214998451U/en active Active
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