CN216077625U - Centrifugal fan and range hood applying same - Google Patents
Centrifugal fan and range hood applying same Download PDFInfo
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Abstract
The utility model relates to a centrifugal fan and a range hood applying the same, comprising a volute and an impeller, wherein the molded line of the volute comprises a first straight line segment, a spiral line segment, a volute tongue-shaped line segment and a second straight line segment which are sequentially arranged and smoothly connected in the circumferential direction, the center of the impeller is taken as the origin of coordinates, a rectangular coordinate system is established by taking a horizontal line passing through the original point as an X axis and taking a vertical line passing through the original point as a Y axis, the spiral line segment comprises a first arc segment, a third straight line segment, a second arc segment and a third arc segment which are sequentially and smoothly connected along the clockwise direction of the coordinate system, the first arc segment, the second arc segment and the third arc segment are all eccentrically arranged relative to the circle center of the impeller, and the radiuses of the first arc segment, the second arc segment and the third arc segment are sequentially increased, and the distances from points on the first arc segment, the second arc segment and the third arc segment to the circle center of the impeller are gradually increased along the clockwise direction of the coordinate system. This centrifugal fan can effectively improve the noise problem when improving aerodynamic performance.
Description
Technical Field
The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan and a range hood applying the same.
Background
The centrifugal fan is a common air supply device and is commonly used in products such as a range hood and the like. The fan system is a core component of the range hood, and the reasonability of the size design of the fan system is closely related to the performance of the range hood. The volute of the traditional fan system is designed according to a fan design experience formula and a size recommended proportion, and the condition that the inlet of the fan is smooth is considered, such as a volute profile generation method, a volute and a centrifugal fan of a centrifugal fan disclosed by the application number CN202011022811.3 (the publication number CN112253541A) and a volute of a centrifugal fan for a range hood disclosed by the application number CN 201910333583.2.
The air quantity and the noise of the centrifugal fan, especially the multi-wing centrifugal fan are relatively related performance parameters, the noise generated in the operation process can be increased along with the increase of the air quantity, in order to improve the pneumatic performance of the centrifugal fan, most of the existing centrifugal fans are the optimization design of the molded line of the volute in the environment without shielding all around, and the influence of the working condition environment of the centrifugal fan is not considered, for example, when the centrifugal fan is applied to the working condition environment of a range hood, the centrifugal fan is placed in a fan frame box body, only the lower area of the periphery of an air inlet of the centrifugal fan is in a relatively unobstructed state, the problem of uneven airflow at the air inlet is caused because other directions receive shielding, if the traditional logarithmic spiral line or the corrected volute molded line on the basis is still adopted, because the opening degree of the volute molded line is relatively larger, the flow separation of the uneven airflow entering from the air inlet into the volute is increased in the volute, the noise problem is severe. Therefore, the volute profile design of the existing centrifugal fan is only used for improving the aerodynamic performance, and the problem of noise caused by the increase of the aerodynamic performance is not considered. Therefore, how to provide a centrifugal fan capable of improving aerodynamic performance and effectively improving noise becomes a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The first technical problem to be solved by the present invention is to provide a centrifugal fan capable of improving aerodynamic performance and effectively improving noise problem, in view of the current state of the prior art.
The second technical problem to be solved by the present invention is to provide a range hood using the centrifugal fan in view of the current situation of the prior art.
The technical scheme adopted by the utility model for solving the first technical problem is as follows: a centrifugal fan comprises a volute and an impeller arranged in the volute, wherein the molded line of the volute comprises a first straight line section, a spiral line section, a volute tongue-shaped line section and a second straight line section which are sequentially arranged in the circumferential direction and are connected smoothly, and the starting point of the first straight line section and the end point of the second straight line section respectively correspond to two ends of an air outlet of the volute;
the method comprises the steps of establishing a rectangular coordinate system by taking the circle center of an impeller as an origin of coordinates, taking a horizontal line passing through the origin of coordinates as an X axis and taking a vertical line passing through the origin of coordinates as a Y axis, wherein the spiral line segment comprises a first circular arc segment, a third straight line segment, a second circular arc segment and a third circular arc segment which are sequentially and smoothly connected along the clockwise direction of the coordinate system, the first circular arc segment, the second circular arc segment and the third circular arc segment are eccentrically arranged relative to the circle center of the impeller, the radiuses of the first circular arc segment, the second circular arc segment and the third circular arc segment are sequentially increased, the distances from points on the first circular arc segment, the second circular arc segment and the third circular arc segment to the circle center of the impeller are gradually increased along the clockwise direction of the coordinate system, the first circular arc segment is positioned in the first quadrant and the second quadrant of the rectangular coordinate system, the third straight line segment is positioned in the first quadrant and the fourth quadrant of the rectangular coordinate system, and the curve section formed by connecting the second arc section and the third arc section is positioned in the third quadrant and the fourth quadrant of the rectangular coordinate system.
Because the end point position of each circular arc section in the spiral line has obvious influence on the pneumatic performance of the centrifugal fan, in particular to the multi-wing centrifugal fan, the starting point of the first circular arc section is connected with the end point of the volute tongue-shaped line section, and the deflection included angle of the joint position point of the first circular arc section and the volute tongue-shaped line section relative to the positive direction of the X axis of a coordinate system is theta 1, wherein theta 1 is more than or equal to 102.7 degrees and is less than or equal to 112.7 degrees;
the terminal point of the first arc segment is connected with the starting point of the third straight-line segment, and the deflection included angle of the joint position point of the first arc segment and the third arc segment relative to the positive direction of the X axis of the coordinate system is theta 2, wherein theta 2 is more than or equal to 19.7 degrees and less than or equal to 29.7 degrees;
the starting point of the second arc segment is connected with the end point of the third straight line segment, and the deflection included angle of the joint position point of the second arc segment and the end point of the third straight line segment relative to the positive direction of the X axis of the coordinate system is theta 3, wherein theta 3 is more than or equal to 31.4 degrees and less than or equal to 41.4 degrees;
the terminal point of the second arc segment is connected with the starting point of the third arc segment, and the joint position point of the second arc segment and the third arc segment deflects relative to the positive direction of the X axis of the coordinate system by an included angle theta 4, wherein theta 4 is more than or equal to 87.1 degrees and less than or equal to 97.1 degrees;
the terminal point of the third arc segment is connected with the starting point of the second straight segment, and the deflection included angle of the combined position point of the third arc segment and the starting point of the second straight segment relative to the positive direction of the X axis of the coordinate system is theta 5, wherein theta 5 is more than or equal to 169.8 degrees and less than or equal to 179.8 degrees.
In order to adapt to the size of an impeller in the volute and further improve the aerodynamic performance of the centrifugal fan, the diameter of the impeller is marked as D, the distance from the joint position point of the starting point of the first arc segment and the end point of the volute tongue type line segment to the circle center of the impeller is L1, and L1 is more than or equal to 0.542D and less than or equal to 0.580D;
the distance from the joint position point of the end point of the first circular arc segment and the starting point of the third straight-line segment to the center of the impeller is L2, and L2 is more than or equal to 0.593D and less than or equal to 0.631D;
the distance from the joint position point of the starting point of the second circular arc segment and the end point of the third straight line segment to the center of the impeller is L3, and L3 is not less than 0.675D and not more than 0.713D;
the distance from a joint position point of the end point of the second circular arc segment and the starting point of the third circular arc segment to the center of the impeller is L4, and L4 is more than or equal to 0.742D and less than or equal to 0.780D;
the distance from the joint position point of the end point of the third arc segment and the starting point of the second straight line segment to the center of the impeller is L5, and L6 is more than or equal to 0.981D and less than or equal to 1.019D.
The radiuses of all circular arc sections of the spiral line cannot be too large, otherwise, the expansion degree change of different angle areas (especially the joint position area of the two continuous reading sections) of the volute is easily caused to be large, the integral noise reduction purpose of the centrifugal fan is not facilitated, the diameter of the impeller is marked as D, the radius of the first circular arc section is R1, and R1 is more than or equal to 0.633D and 0.593D is more than or equal to R1;
the radius of the second circular arc section is R2, R2 is more than or equal to 0.715D and is more than or equal to 0.755D;
the radius of the third arc segment is R3, R3 is more than or equal to 0.745D and is less than or equal to 0.785D.
In order to realize effective conversion of dynamic and static pressure at the outlet of the impeller and reduce outlet resistance, the deflection included angle of the terminal point of the second straight line section relative to the positive direction of the X axis of a coordinate system is theta 6, theta 6 is larger than or equal to 130.8 degrees and smaller than or equal to 140.8 degrees, the distance from the terminal point of the second straight line section to the circle center of the impeller is L6, and L6 is larger than or equal to 0.981D and smaller than or equal to 1.019D.
The technical scheme adopted by the utility model for solving the second technical problem is as follows: a range hood using the centrifugal fan.
Compared with the prior art, the utility model has the advantages that: the spiral section of the volute profile of the centrifugal fan is formed by a first arc section, a third straight section, a second arc section and a third arc section which are sequentially and smoothly connected along the clockwise direction of a coordinate system, wherein the first arc section, the second arc section and the third arc section are all eccentrically arranged relative to the circle center of the impeller, and the radius is sequentially increased, so that the deflection change of a gap between the volute and the impeller is realized. Through experimental comparison, the volute molded line design can effectively improve the pneumatic performance of the fan and increase the air volume by 1m compared with the design of adopting the traditional logarithmic spiral line under the same noise level3And a/min period. In addition, the design of the straight line segment is adopted between the first circular arc segment and the second circular arc segment of the spiral segment of the volute, so that the size of the volute in the left-right direction is reduced, and the overall size of the centrifugal fan is smaller.
Drawings
Fig. 1 is a schematic perspective view of a centrifugal fan according to an embodiment of the present invention (omitting front and rear side plates of a volute, a motor, and other components);
fig. 2 is a scroll-type diagram of a centrifugal fan (showing an impeller) according to an embodiment of the present invention.
Detailed Description
The utility model is described in further detail below with reference to the accompanying examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Referring to fig. 1 and 2, the centrifugal fan includes a scroll casing 10, a motor (not shown), and an impeller 20 provided in the scroll casing 10. The centrifugal fan of the present embodiment is a multi-bladed centrifugal fan, i.e. the impeller 20 comprises a front disk (not shown), a rear disk (not shown) and blades (not shown) circumferentially distributed therebetween.
In this embodiment, the profile of the volute 10 is mainly designed, the volute 10 includes an annular wall 11, a front side plate (not shown) and a rear side plate (not shown), the contour line of the cross section of the annular wall 11 is the profile of the volute, referring to fig. 2, the circle center O of the impeller is used as the origin of coordinates, the horizontal line passing through the origin of coordinates is the X axis, the vertical line passing through the origin of coordinates is the Y axis, and a rectangular coordinate system is established, wherein the air outlet of the volute 10 is located in the second quadrant of the coordinate system, that is, corresponds to the positive direction of the X axis and the positive direction of the Y axis. The volute 10 profile comprises a first straight line segment AB, a volute tongue profile BC, a spiral line segment CG and a second straight line segment GH which are sequentially arranged in the circumferential direction (clockwise direction along the coordinate system) and are connected smoothly, wherein the starting point of the first straight line segment AB and the end point of the second straight line segment GH respectively correspond to two ends of the air outlet of the volute 10. The spiral line segment CG comprises a first arc segment CD, a third straight line segment DE, a second arc segment EF and a third arc segment FG which are sequentially and smoothly connected along the clockwise direction of a coordinate system, the first arc segment CD, the second arc segment EF and the third arc segment FG are all opposite to the center of a circle of the impeller in an eccentric mode, the radius of the first arc segment CD, the radius of the second arc segment EF and the radius of the third arc segment FG are sequentially increased, and the distance from a point on the first arc segment CD, the second arc segment EF and the third arc segment FG to the center of the circle of the impeller is gradually increased along the clockwise direction of the coordinate system. The distances from the points on the first arc segment CD, the second arc segment EF and the third arc segment FG to the center of the impeller gradually increase along the clockwise direction of the coordinate system.
The volute tongue molded line of the embodiment is also a circular arc line segment. The first circular arc section CD is positioned in a first quadrant and a second quadrant of a rectangular coordinate system, the starting point of the first circular arc section CD of the spiral line section CG is connected with the volute tongue type line section BC, the joint position point of the first circular arc section CD and the starting point of the third straight line section DE is positioned in the second quadrant of the coordinate system, the terminal point of the first circular arc section CD is in smooth transition connection with the starting point of the third straight line section DE, and the joint position point of the first circular arc section CD and the starting point of the third straight line section DE is positioned in the first quadrant of the coordinate system. The end point of the third straight line segment DE is connected with the start point of the second circular arc segment EF in a smooth transition mode, and the joint position point of the two is located in the fourth quadrant of the coordinate system, that is, the third straight line segment DE is located in the first quadrant and the fourth quadrant of the rectangular coordinate system. And the curve section formed by connecting the second arc section EF with the third arc section FG is positioned in the third quadrant and the fourth quadrant of the rectangular coordinate system.
The starting point of the first circular arc segment CD is connected with the end point of the volute tongue type line segment BC, and the joint position point of the two is deflected in the positive direction of the X axis of the coordinate system by an included angle theta 1, wherein theta 1 is larger than or equal to 102.7 degrees and smaller than or equal to 112.7 degrees, and theta 1 is preferably 107.7 degrees. The diameter of the impeller of the embodiment is marked as D, the distance from the joint position point of the starting point of the first circular arc segment CD and the terminal point of the volute tongue type line segment BC to the center of the impeller is L1, L1 is more than or equal to 0.580D, L1 is preferably 0.561D,
the terminal point of the first circular arc segment CD is connected with the starting point of the third straight line segment DE in a smooth transition mode, and the joint position points of the first circular arc segment CD and the third straight line segment DE deflect relative to the positive direction of the X axis of the coordinate system at an included angle theta 2 which is more than or equal to 19.7 degrees and less than or equal to 29.7 degrees, and theta 2 is preferably 24.7 degrees. The distance from the joint point of the end point of the first circular arc segment CD and the starting point of the third straight-line segment DE to the center of the impeller is L2, L2 is more than or equal to 0.593D and less than or equal to 0.631D, and L2 is preferably 0.612D.
The starting point of the second circular arc section EF is connected with the end point of the third straight line section DE in a smooth transition mode, and the joint position point of the second circular arc section EF and the third straight line section DE deflects relative to the positive direction of the X axis of the coordinate system by an included angle theta 3 which is larger than or equal to 31.4 degrees and smaller than or equal to theta 3 and smaller than or equal to 41.4 degrees, and theta 3 is preferably 36.4 degrees. The distance from the joint position point of the starting point of the second circular arc section EF and the end point of the third straight-line section DE to the center of the impeller is L3, L3 is more than or equal to 0.675D and less than or equal to 0.713D, and L3 is preferably 0.694D.
The terminal point of the second arc segment EF is connected with the starting point of the third arc segment FG, and the deflection included angle of the joint position point of the second arc segment EF and the third arc segment FG relative to the positive direction of the X axis of the coordinate system is theta 4, theta 4 is more than or equal to 87.1 degrees and less than or equal to 97.1 degrees, and theta 4 is preferably 92.1 degrees. The distance from the joint position point of the terminal point of the second circular arc section EF and the starting point of the third circular arc section FG to the center of the impeller is L4, L4 is more than or equal to 0.742D and less than or equal to 0.780D, and L4 is preferably 0.761D.
The terminal point of the third arc segment FG is in smooth transition connection with the starting point of the second straight line segment GH, and the combined position point of the two segments deflects relative to the positive direction of the X-axis of the coordinate system by an included angle theta 5, wherein theta 5 is more than or equal to 169.8 degrees and less than or equal to 179.8 degrees, and theta 5 is preferably 175.8 degrees. The distance from the joint position point of the end point of the third arc section FG and the starting point of the second straight line section GH to the center of the impeller is L5, wherein L6 is more than or equal to 0.981D and less than or equal to 1.019D, and L5 is preferably 0.834D.
The terminal point of the second straight line segment GH deflects by an included angle theta 6 relative to the positive direction of the X axis of the coordinate system, wherein theta 6 is more than or equal to 130.8 degrees and less than or equal to 140.8 degrees, and theta 6 is preferably 135.8 degrees.
The distance from the end point of the second straight line segment GH to the center of the impeller is L6, L6 is more than or equal to 0.981D and less than or equal to 1.019D, and L6 is preferably 1D.
The embodiment also relates to a range hood applying the centrifugal fan.
The spiral section of the volute 10 profile of the centrifugal fan in the embodiment is formed by a first arc section CD, a third straight section DE, a second arc section EF and a third arc section FG which are sequentially and smoothly connected along the clockwise direction of a coordinate system, wherein the first arc section CD, the second arc section EF and the third arc section FG are all eccentrically arranged relative to the circle center of an impeller, and the radiuses of the first arc section CD, the second arc section EF and the third arc section FG are sequentially increased, so that the deflection change of a gap between the volute 10 and the impeller is realized, and the volute 10 profile connected through a plurality of smooth arcs is designed, so that the volute is relatively contracted along the flowing direction of air flow on the whole, oil smoke gas can be better guided to flow smoothly, the fluid flow separation inside the volute 10 is inhibited, and the pneumatic noise is reduced while the fan performance is improved. Through experimental comparison, compared with the traditional logarithmic spiral, the volute 10 molded line design can effectively improve the pneumatic performance of the fan and increase the air volume by about 1m 3/min. In addition, the design of the straight line segment is adopted between the first circular arc segment CD and the second circular arc segment EF of the spiral segment of the volute 10, the volume increase size of the volute 10 in the left and right direction is reduced, and the whole volume of the centrifugal fan is smaller.
Claims (6)
1. A centrifugal fan comprises a volute (10) and an impeller (20) arranged in the volute (10), wherein the molded line of the volute (10) comprises a first straight line segment (AB), a volute tongue molded line segment (BC), a spiral line segment (CG) and a second straight line segment (GH) which are sequentially arranged in the circumferential direction and are connected smoothly, and the starting point of the first straight line segment (AB) and the end point of the second straight line segment (GH) respectively correspond to the two ends of an air outlet of the volute (10);
the method is characterized in that: the circle center (O) of the impeller (20) is used as a coordinate origin, a horizontal line passing through the coordinate origin is an X axis, a vertical line passing through the coordinate origin is a Y axis, a rectangular coordinate system is established, the spiral line segment (CG) comprises a first circular arc segment (CD), a third straight line segment (DE), a second circular arc segment (EF) and a third circular arc segment (FG) which are sequentially and smoothly connected along the clockwise direction of the coordinate system, the first circular arc segment (CD), the second circular arc segment (EF) and the third circular arc segment (FG) are eccentrically arranged relative to the circle center (O) of the impeller (20), the radiuses of the first circular arc segment (CD), the second circular arc segment (EF) and the third circular arc segment (FG) are sequentially increased, the distances from points on the first circular arc segment (CD), the second circular arc segment (EF) and the third circular arc segment (FG) to the circle center (O) of the impeller (20) are gradually increased along the clockwise direction of the coordinate system, first circular arc section (CD) is arranged in the first quadrant and the second quadrant of rectangular coordinate system, third straightway (DE) is arranged in the first quadrant and the fourth quadrant of rectangular coordinate system, second circular arc section (EF) meets the curve section that forms with third circular arc section (FG) and is arranged in the third quadrant and the fourth quadrant of rectangular coordinate system.
2. The centrifugal fan of claim 1, wherein: the starting point of the first arc segment (CD) is connected with the end point of the volute tongue type line segment (BC), and the joint position point of the first arc segment and the volute tongue type line segment deflects in the positive direction of the X axis of a coordinate system by an included angle theta 1 which is more than or equal to 102.7 degrees and less than or equal to 112.7 degrees;
the terminal point of the first circular arc section (CD) is connected with the starting point of the third straight section (DE), and the joint position point of the first circular arc section and the third straight section deflects in the positive direction of the X axis of the coordinate system by an included angle theta 2 which is more than or equal to 19.7 degrees and less than or equal to 29.7 degrees;
the starting point of the second circular arc section (EF) is connected with the end point of the third straight line section (DE), and the joint position point of the second circular arc section and the end point deflects by an included angle theta 3 relative to the positive direction of the X axis of the coordinate system, wherein theta 3 is more than or equal to 31.4 degrees and less than or equal to 41.4 degrees;
the terminal point of the second arc segment (EF) is connected with the starting point of the third arc segment (FG), and the joint position point of the two deflects relative to the positive direction of the X axis of the coordinate system by an included angle theta 4, wherein theta 4 is more than or equal to 87.1 degrees and less than or equal to 97.1 degrees;
the terminal point of the third arc segment (FG) is connected with the starting point of the second straight segment (GH), and the combined position point of the third arc segment and the starting point of the second straight segment is deflected in the positive direction of the X axis of the coordinate system by an included angle theta 5, wherein theta 5 is more than or equal to 169.8 degrees and less than or equal to 179.8 degrees.
3. The centrifugal fan of claim 2, wherein: the diameter of the impeller is marked as D, the distance from the joint position point of the starting point of the first circular arc section (CD) and the end point of the volute tongue type line section (BC) to the circle center (O) of the impeller (20) is L1, and L1 is more than or equal to 0.542D and less than or equal to 0.580D;
the distance from the joint position point of the end point of the first circular arc section (CD) and the starting point of the third straight line section (DE) to the center (O) of the impeller (20) is L2, and L2 is more than or equal to 0.593D and less than or equal to 0.631D;
the distance from the joint position point of the starting point of the second circular arc section (EF) and the end point of the third straight line section (DE) to the center (O) of the impeller (20) is L3, and L3 is not less than 0.675D and not more than 0.713D;
the distance from a joint position point of the terminal point of the second circular arc segment (EF) and the starting point of the third circular arc segment (FG) to the center (O) of the impeller (20) is L4, and L4 is not less than 0.742D and not more than 0.780D;
the distance from the joint position point of the end point of the third arc segment (FG) and the starting point of the second straight line segment (GH) to the center (O) of the impeller (20) is L5, and L6 is not less than 0.981D and not more than 1.019D.
4. The centrifugal fan of claim 1, wherein: the diameter of the impeller (20) is marked as D, the radius of the first circular arc section (CD) is R1, R1 is more than or equal to 0.593D and less than or equal to 0.633D;
the radius of the second circular arc section (EF) is R2, R2 is more than or equal to 0.715D and less than or equal to 0.755D;
the radius of the third arc segment (FG) is R3, and R3 is more than or equal to 0.745D and less than or equal to 0.785D.
5. The centrifugal fan according to any one of claims 1-4, wherein: the deflection included angle of the terminal point of the second straight line segment (GH) relative to the positive direction of the X axis of the coordinate system is theta 6, theta 6 is larger than or equal to 130.8 degrees and smaller than or equal to 140.8 degrees, the distance from the terminal point of the second straight line segment (GH) to the circle center of the impeller (20) is L6, and L6 is larger than or equal to 0.981D and smaller than or equal to 1.019D.
6. A range hood using the centrifugal fan as claimed in any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122088796.9U CN216077625U (en) | 2021-08-31 | 2021-08-31 | Centrifugal fan and range hood applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122088796.9U CN216077625U (en) | 2021-08-31 | 2021-08-31 | Centrifugal fan and range hood applying same |
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| Publication Number | Publication Date |
|---|---|
| CN216077625U true CN216077625U (en) | 2022-03-18 |
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| CN202122088796.9U Active CN216077625U (en) | 2021-08-31 | 2021-08-31 | Centrifugal fan and range hood applying same |
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